Reggie Agbeko's up-and-under layup at the 1:33 mark was the first field goal in the extra session for either team as Saint Louis led 62-58. Aaron Brown hit Saint Joseph's only basket in overtime with 43 seconds left to cut its deficit to 64-61, but Saint Louis closed the game with two free throws and a fast break dunk.
Brown scored 21 for Saint Joseph's (9-12, 3-6), DeAndre Bembry added 19 with 12 rebounds.
Bembry hit one free throw with 1:01 left in regulation to knot the game at 55. Bartley answered with a basket for Saint Louis but Bembry scored a layup to tie again.