St Bonaventure stuns No. 18 Saint Louis 71-68 at buzzer in A-10 tourney on Gathers 3

St. Bonaventure's Matthew Wright, left, passes in front of Saint Louis' Rob Loe during the first half of an NCAA college basketball game in the quarterfinal round of the A10 Conference tournament at the Barclays Center in New York, Friday, March 14, 2014. (AP Photo/Seth Wenig) (The Associated Press)

Saint Louis's Mike McCall Jr., left, passes around St. Bonaventure's Charlon Kloof during the first half of an NCAA college basketball game in the quarterfinal round of the A10 Conference tournament at the Barclays Center in New York, Friday, March 14, 2014. (AP Photo/Seth Wenig) (The Associated Press)

NEW YORK – Jordan Gathers hit a 3-pointer at the buzzer, and St. Bonaventure stunned No. 18 Saint Louis 71-68 in the quarterfinals of the Atlantic 10 tournament Friday.

The ninth-seeded Bonnies (18-14) came into the tourney on a four-game losing streak before beating La Salle on Thursday. They trailed the top-seeded Billikens by 10 points at halftime but rallied behind a swarming defense and clutch 3-point shooting.

Saint Louis big man Dwayne Evans, who had hit three 3-pointers all season, made a 3 over 7-foot Youssou Ndoye with 20.9 seconds left to tie the game at 68-68.

Matthew Wright and Charlon Kloof led St. Bonaventure with 22 points. Gathers had just two points before making the winner.

Mike McCall scored 21 for Saint Louis (26-6), which lost its first game in its attempt to defend its A-10 tournament title. The Billikens have dropped four of five.