San Antonio Spurs

Being that the Spurs sport the NBA’s best offensive efficiency, it should come as no surprise that they are a well above average offensive team in each of the four quarters. Even in their worst offensive quarters, San Antonio still scores at a rate that would rank among the league’s top five in points per possession. They are especially effective in the first and second quarters, scoring at 8.39 and 8.96 points per 100 possessions better than league average, respectively. In the first quarter, San Antonio has had 10 players play at least 200 minutes this season, and eight of them are shooting at least 45% from the field. Of the two who are not shooting above 45%, one is no longer with the team – Richard Jefferson – and the other is shooting 43.6% from 3-point land in the first quarter – Matt Bonner.
The Spurs also defend at an above average level for three of the four quarters, with the second quarter being the only one where they allow more points per 100 possessions than the league average. San Antonio really clamps down on defense when the game enters clutch time; their 95.3 points per 100 possessions allowed in the clutch ranks fourth in the NBA and would lead the league over the course of a full season. San Antonio does seem to be a much better team in the first half than the second; in the third and fourth quarters, they outscore their opponents by 3.9 and 4.5 points per 100 possessions, respectively, as opposed to 11.9 and 8.3 points per 100 possessions in the first and second quarters.
Oklahoma City Thunder

Oklahoma City is the only NBA team that sports both an above average offensive efficiency and an above average defensive efficiency in all four quarters, though they cut it extremely close in the second quarter with their 102.5 defensive efficiency. OKC scores 114.8 points per 100 possessions in the second quarter, 12.26 points per 100 possessions better than the league average. How are they doing it? Their top six players in second quarter minutes played – Kevin Durant, James Harden, Russell Westbrook, Kendrick Perkins, Nick Collison and Serge Ibaka – are each shooting above 47% from the field in the quarter, led by Collison at 63.6%. As a team, OKC shoots 50.5% from the field, 38.1% from 3 and 80.2% from the line in the second quarter. They also attempt 26.8 free throws per 48 minutes in the second quarter, a mark which would lead the league over the course of a full season.
The Thunder, like the Spurs, are better in the first half than the second. They outscore opponents by 7.9 points per 100 possessions in the 1st quarter and 12.3 points per 100 possessions in the second quarter, but that drops to 5.4 and 3.5 points per 100 possessions in the third and fourth quarters. However, Durant and Westbrook – their best players and the most likely ones to sit in a blowout – have sat out the entire fourth quarter in 10 and 11 games, respectively, so it is possible that OKC’s reserves are throwing off the balance in the second half. Harden has sat the whole fourth quarter just three times.
Los Angeles Lakers

Tracking the Lakers’ performance across quarters is perhaps best done by by also tracking Kobe Bryant. When healthy, Bryant usually plays the entire first quarter; he averages 11.22 first quarter minutes per game. When Bryant is on the floor, the Lakers outscore their opponents by 9.9 points per 100 possessions, score at a rate which would rank seventh in the NBA over a full season and defend at a rate that would lead the league. In the 129 first quarter minutes Bryant hasn’t played, LA has outscored opponents by just 1.3 points per 100 possessions.
Bryant takes his first rest of the game at the beginning of the second quarter, usually for about 5-6 minutes. We can see here that LA’s offense drops slightly in the second quarter and that their defense falls way off. They go from the best defense in the NBA to one that would rank tied for 27th with the Golden State Warriors. Presumably, Los Angeles’ bench is playing poor defense and poor offense, and then Kobe comes in and rights the ship, right? Wrong. In the 5-6 minutes that Kobe spends off the floor in the second quarter, the Lakers score 106.4 points per 100 possessions and allow 101.3 points per 100 possessions, outscoring their opponents by 5.1.
When Kobe re-enters the game though, the Lakers fall apart. With Bryant on the floor in the second quarter, LA is outscored by an average of 9.0 points per 100 possessions; 101.8 to 110.8. That’s 3-full-points-per-100-possessions-worse-than-the-Bobcats level defense for the six second quarter minutes Kobe averages per game. On offense, Kobe turns it over 4.0 times per-36 minutes and his shots are turned into offensive rebounds about 13% less of the time than on average.
In the third quarter, Bryant again usually plays all twelve minutes barring injury or foul trouble. The Lakers are pretty much a league average team on both ends in the third quarter. They score 100.9 points per 100 possessions (would rank 19th) and allow 101.1 (would rank 12th).
In the fourth quarter, Bryant again usually rests for the first 5-6 minutes. The Lakers’ offense rebounds and averages 104.3 points per 100 possessions overall in the fourth and their defense allows 102.8, slightly worse than in the third quarter. Last time, we assumed the poor defense and slightly worse offense was due to the Lakers’ bench unit being in and we were wrong. This time, however, that’s spot on. When Bryant is on the bench in the fourth quarter, LA scores at a rate of 94.4 points per 100 possessions and allows 104.1. That offense would rank 29th in the league and the defense would be 24th. But when Kobe comes back in for the last 6-7 minutes, the whole offense shifts. The Lakers score 110.9 points per 100 possessions with Bryant on the floor in the fourth quarter, an increase of 16.5 points per 100 possessions from when he’s not on the floor and a mark that would lead the league over a full season. Bryant’s turnovers drop way down, his shots are offensive rebounded more often (as a percentage of missed shots) and his assist/turnover ratio jumps by 17.5%.
Los Angeles Clippers

The Clippers are pretty schizophrenic across quarters. In the first, they have an elite level offense and a below average defense, and outscore their opponents by 7.0 points per 100 possessions. In the second quarter, their offense collapses, their defense gets even worse and they get outscored by 4.6 points per 100 possessions. The beginning of the second quarter usually coincides with Chris Paul’s first stint on the bench of the game, and when he’s out, LA’s offense suffers greatly, scoring just 94.0 points per 100 possessions. Caron Butler and Randy Foye are each shooting under 40% in the second quarter.
In the third quarter the Clippers sport an offense that would be among the top five in the league and a much improved defense over the rest of the game. They allow just 99.7 points per 100 possessions in the fourth quarter, 3.1 points better than their next best defensive quarter. That mark would tie them for ninth in the league with Oklahoma City, while their full-season rank is 17th. The third is the only quarter where the Clippers have an above average offense and an above average defense.
In the fourth quarter, their offense takes another dip when Paul rests, as it does during the second quarter. Their defense regresses as well, though it’s not quite as bad as in the first half. In clutch situations, the Clippers’ offensive efficiency is just the 18th best in the league, surprising for a Chris Paul-led team. Their defense sits 12th in efficiency in crunch time.
Memphis Grizzlies

The second quarter is a nightmare for the Grizzlies. A top ten-level defense in every other quarter, Memphis surrenders 105.7 points per 100 possessions in the second, a mark that would place them 26th in the NBA, tied with the Cavaliers. They played a bunch of lineups earlier in the season that featured O.J. Mayo, Marreese Speights and either Jeremy Pargo or Josh Selby, and that’ll throw your defense off a bit. But the Grizzlies’ D has been really bad in the second quarter even when their better defenders like Tony Allen are on the court. The Grizzlies also play their best offense of the game in the second, largely when Mike Conley, Rudy Gay and/or Zach Randolph is on the floor. Conley has a particularly strong effect; when he’s on the court Memphis scores 109.2 points per 100 possessions and when he leaves they score just 96.6 points per 100.
Memphis’ offense is below average in every other quarter, but their defense is well above average, especially in the first and third. The 94.9 and 95.5 points per 100 possessions Memphis allows in the first and third quarters best and equal Chicago’s league-leading mark. Their defense is mostly very good, but Memphis struggles to score. They don’t shoot very many 3′s and they make them at a below average rate. They only get to the free throw line a league average amount, and they only shoot about the league average from the stripe.
Denver Nuggets

The Nuggets’ are the bizarro version of the Grizzlies. Consistently below average on defense for three quarters of the game, Denver locks down in the second quarter, allowing just 100.1 points per 100 possessions. Their solidly above average offense goes bonkers at the same time. Their 110.2 points per 100 possessions scored in the second quarter would be the best in the league over the course of the season. The defense is best with Danilo Gallinari out there, as they surrender just 88.1 points per 100 possessions when he’s on the court in the second quarter. Gallo also has considerable impact on their offense, which scores 112.1 points per 100 possessions in the 7.5 minutes per game he gets in the second quarter.
Other than that one quarter though, the Nuggets are a pretty ordinary bunch. They have an above average offense and below average defense in each of the first, third and fourth quarters. They get outscored by 0.3 points per 100 possessions in the first quarter and by 1.7 points per 100 possessions in the fourth. They barely squeak by their opponents by 0.9 points per 100 possessions in the third. Denver suffers from a similar problem to the Philadelphia 76ers in that their offense falters in the fourth quarter because they don’t have a true go-to guy to get them a bucket when the defense clamps down. Denver’s spread-it-around approach works for much of the game, but fails them late. Gallinari, often an option down the stretch, shoots just 30.3% in the fourth quarter this year.
Dallas Mavericks

The only quarter where the Mavericks are above average on both offense and defense is the first quarter, though their offense is just 0.5 points per 100 possessions better than average. In what is their best quarter of the game, Dallas outscores their opponents by just 4.3 points per 100 possessions, about a Hawks or Sixers level scoring margin. Again, this is the Mavs’ best quarter.
In what seems to be a pattern, Dallas also has a quarter where their offense completely falls off a cliff. After scoring 106 points per 100 possessions in the second quarter (where every Mav who has played at least 100 minutes in the period is shooting at least 44.1% from the field), a mark that would place them fourth in the NBA, that number drops all the way to 96.6 in the third quarter, which would rank 29th in the NBA over the full season. Though they play their best defense of the game in the third, they manage to outscore their opponents by just 0.3 points per 100 possessions in the period. Dirk Nowitzki shoots just 43.1% in the third quarter of games and Jason Terry’s field goal percentage drops under 40. Every Mav who has played at least 100 third quarter minutes is shooting under 44% from the field in the period. In the fourth quarter, Dallas actually gets outscored by an average of 0.7 points per 100 possessions on average.
Utah Jazz*

The Jazz are a pretty average team in the first half of games. They score at a slightly below average rate in the first quarter and a slightly above average rate in the second. They also defend at a slightly below average rate in the first quarter and a slightly above average rate in the second. Those net ratings would place them somewhere between the Mavericks (+1.5) and the Timberwolves (-1.7) over the course of a full season.
But everything goes haywire in the second half. Their previously league average offense takes a significant jump all the way to 106.6 points per 100 possessions scored in the third quarter. With Gordon Hayward on the court, as he has been for 583 of the Jazz’s 768 third quarter minutes, the Jazz have scored 110.4 points per 100 possessions, which would lead the league by a good margin. However, they also allow 109.2 points per 100 possessions in Hayward’s time on the floor in the third, a mark that would place Utah second-to-last in the NBA, just ahead of the Charlotte Bobcats. Despite playing elite level offense in the third, Utah is actually outscored by 0.5 points per 100 possessions in the period.
In the fourth quarter, the Jazz also score at an elite level and defend like one of the worst teams in the league. So the average on offense, average on defense first half Jazz are still pretty average in the second half of games, but it’s because they sport an excellent offense and a terrible defense.
Phoenix Suns*

The Suns are an above average team for three quarters of the game, but they completely fall apart when Steve Nash takes his first rest of the game in the second quarter. With Nash on the bench for usually about the first 5-6 minutes of the second, Phoenix scores just 98.5 points per 100 possessions and allows 106.6 Each of these marks would place the Suns in the bottom five in the NBA over the course of a full season. The -5.8 points per 100 possessions scoring margin puts them in the range of the Kings and Nets.
After halftime, their offense bounces back and averages 107.3 points per 100 possessions, which would rank just behind the Spurs for first in the NBA and just ahead of the Thunder for second. Nash, when healthy, usually plays just about all of the third quarter, and when he is on the floor, Phoenix scores 110.4 points per 100 possessions in the period. He’s aided by especially hot shooting from Marcin Gortat (60.8%), Jared Dudley (50.0% from the field, 42.0% from 3) and Shannon Brown (41.9% from 3). Phoenix’s positive scoring margin of 4.3 points per 100 possessions in the third would be top five in the NBA over the course of a full season.
*Signifies team fighting for 8th seed
Statistical support for this story from NBA.com – All charts also created with data supplied by NBA.com