[Kram] I conducted my own study of fouling up three, using GeniusIQ to filter for all possessions from the past five seasons… Teams that chose to foul up three won 92.0% of their games, versus 91.7% for those that played normal defense.
I wanted to test the facts of the situation, so I conducted my own study of fouling up three, using GeniusIQ to filter for all possessions from the past five seasons in which the defensive team was leading by three points in the final 24 seconds. By watching those plays and tracking their outcomes – looking specifically for an overt, visible effort to intentionally foul – I found, first, when teams are most likely to employ the strategy.
Then, by narrowing the scope to possessions between 3 and 17 seconds – when the vast majority of fouls occurred – I could compare the overall win probability when teams decide to foul with when they play straight-up defense.
The results from 524 games with this decision are remarkably similar. Teams that chose to foul up three won 92.0% of their games, versus 91.7% for those that played normal defense.
Different studies on this topic have yielded different results, depending on the parameters. (Most public studies are either from years ago or focus on NCAA basketball, which has different late-game rules.) Generally, team employees said their data suggests fouling works in limited circumstances.
But an Eastern Conference executive who has studied the math behind this strategy confirmed the general conclusion of my study: Whatever edge is gained from fouling is small. This isn’t a clear-cut analytical slam dunk like shooting more 3-pointers or NFL teams going for it on fourth down.
“You could coach your whole career employing either strategy and win pretty much the same number of those close-game situations,” the executive said.
“You’ve seen this year how many people have missed the free throw on purpose and got it back and gotten a great look,” Nurse said. “I think people are getting better at missing it. I think the rebounds are not so lopsided towards the defense anymore. They’ve become 50-50, almost like loose balls rather than rebounds.”
Nurse is right: Over the past two seasons, according to an analysis of GeniusIQ data, teams trailing by two or three points in the final 10 seconds have successfully rebounded 16 of 38 missed free throws, or 42% (including violations that don’t hit the rim). That’s four times higher than the 10.5% offensive rebounding rate on missed free throws in all situations.