Before your team started to intentionally foul, your opponent shot 31 free throws and drained 18 of them while you only shot 17 while converting only 8. Honestly, you probably would've lost by much more if his SF didn't get injured 6 minutes into the game and be replaced by a 16k PF.
It also didn't help that because of the zone, his PF had to defend quite a few jump shots by the opposing SG - and the SG he played at SF didn't face nearly as many inside shots as he might have otherwise, probably due to the injury.