Tanner Chauncey singled to left field in the 10th inning to drive in the winning run for BYU in a 6-5 series-clinching victory over San Francisco on Friday night at Larry H. Miller Field.

The Cougars loaded the bases in the bottom of the 10th with nobody out before Chauncey singled over the left fielder’s head to put BYU (20-19, 10-7) higher than .500 for the first time this season.

A day after getting up big on San Francisco (22-22, 14-6) early, the Cougars came back from two different three-run deficits to earn the win.

“This was just a great, great ballgame,” BYU head coach Mike Littlewood said. “For the fans who stayed here, they got a treat."

Mason Marshall (1-1) pitched two scoreless innings in the ninth and 10th for the win. Marshall relieved Brandon Kinser who pitched eight innings and struck out seven batters pitching four innings on both ends of the hour and 23 minute rain delay in the fourth inning.

“He was better coming back out,” Littlewood said. “We just had him down in the indoor tunnels throwing about every 15-20 minutes. He’s just such a gamer.”

Chauncey finished 3-for-5 with his lone RBI winning the game. Bronson Larsen went 3-for-4, scored two runs and extended his hitting streak to 12 games. Brennon Lund used a 10th inning bunt single to extend his hit streak to 19 games. Eric Urry and Dillon Robinson each drove in two runs on two hits for the Cougars.

BYU’s big inning came with three runs in the third inning. Hayden Nielsen reached on an infield single, and Robinson homered to right center field to make it a 4-3 game. Larsen singled and stole a base before Urry singled him in to tie the game at 4-4.

The Cougars scored their first run in the second inning as a Parker Starr double bounced in between a retreating second baseman and an incoming right fielder. Larsen scored from second to make it 3-1.

The Dons struck first for three runs in the first inning after two were out. A Dominic Miroglio double scored two runs, and McCullough singled up the middle for a 3-0 advantage before BYU had hit. San Francisco added its fourth run on a Miroglio single past the shortstop in the third inning.

After the rain delay, the Cougars put the first run on the scoreboard in the seventh inning. Chauncey reached on an infield single and made it to second off an error on the second baseman. The disputed out at second base led to San Francisco head coach Nino Giarratano being ejected. After a strikeout and a fly out to left, which advanced Chauncey to third, Urry singled past the third baseman to score BYU’s fifth run of the game.

The Dons scored in the top of the eighth to tie the game on another run driven in by Miroglio, which sent the game to extras.

The final game of the series takes place at noon MDT, on Saturday. The game will be streamed on TheW.tv and can be heard on KOVO 960 AM. BYU's Michael Rucker (4-1, 3.23) and San Francisco's Christian Cecilio (5-1, 1.82) will start on the mound.