MORGANTOWN, W.Va. (AP) - Reserve guard Tim Quarterman scored 21 points and Josh Gray made the game-winning layup with 7.4 seconds left to help LSU upset No. 16 West Virginia 74-73 on Thursday night.

Jarell Martin had 18 points and 14 rebounds for the Tigers (6-2), who overcame a 14-point deficit in the second half. Keith Hornsby scored 15.

West Virginia (7-1) was off to its best start since opening 11-0 during the 2009-10 Final Four season.

The Mountaineers were led by Juwan Staten's 17 points. Daxter Miles added 13 and Tarik Phillip had 12.

West Virginia led 43-38 at halftime and extended its lead to 14 points in the second half before LSU went on a 15-3 run to pull within three.

Hornsby hit a 3-pointer and two free throws to tie the score at 58.

West Virginia led 66-60 with 5:06 to go. Each team had held a one-point lead until Gray made the decisive layup with 7.4 seconds left.

Ahead by five at halftime, West Virginia opened the second half with nine straight points to take a 52-38 lead with 18:07 to go. Six of the points came off LSU turnovers.

LSU had made just two field goals in the final 6:26 of the first half. But after building its big lead, West Virginia started putting up errant shots.

The Tigers outscored the Mountaineers 15-3 in a span of about seven minutes to cut the margin to three. In the meantime, West Virginia missed seven straight attempts.

Mountaineers reserve Tarik Phillip figured prominently in the second half. His six points increased his team's lead to six and brought fans to their feet with 3:42 remaining.

West Virginia was ahead 71-67 with 1:32 to go, but Martin's tip-in silenced the crowd. That was followed by Hornsby's third 3-pointer in three attempts with 30.7 seconds left to give the Tigers a one-point lead.

Miles' tip-in briefly gave West Virginia a 73-72 edge with 26 seconds to go.

After the Mountaineers gave two fouls, LSU inbounded from near halfcourt and Gray scored the decisive basket.