your guys rebounded better, and your good outside defense was too good for their bad ball movement, so their guards took many bad shots (look at his SG, who led his team in FGA) and turned the ball over 16 times. This led to 10 more possessions for you, which was enough to overcome his advantages in the scoring department.
really, this is a case for the history books, as in "how to defend a superior interior offense that is not supported by good ball movement"