Javon Small scored 31 points to rally West Virginia to an 86-78 overtime upset of No. 3 Gonzaga in the opening round of the Battle 4 Atlantis tournament, Wednesday in Nassau, Bahamas.The Mountaineers (4-1) trailed by 10 points early in the second half and by five in the final minute. But over the final 19 seconds of regulation, Tucker DeVries scored five straight points to send the game to overtime.In the extra session, Small scored five points and West Virginia held Gonzaga to a single field goal, which came after the outcome was decided with 19 seconds left.Amani Hansberry added a career-high 19 points and eight rebounds for West Virginia, which advances to the semifinals Thursday against another surprise first-round winner, Louisville, which stunned No. 15 Indiana.Braden Huff scored 19 points and Khalif Battle added 16 points for Gonzaga (5-1) which settles for a consolation-round game Thursday against Indiana.Nolan Hickman tallied 13 points. Ryan Nembhard delivered seven points and 12 assists for the Bulldogs.Huff put Gonzaga in position to win when he made three hook shots in the final 2:34 of regulation as the Bulldogs turned a one-point deficit into a 69-66 lead.Two free throws by Nembhard expanded the lead to 71-66 with 25 seconds left. But DeVries followed with a 3-pointer from the top of the key and then made a mid-court steal and drew a foul with 5.9 seconds left. His two free throws sent it to overtime.