After being dormant for the entire weekend, OU's offense finally unloaded in this one, ripping 13 hits, including six for extra bases to help head coach Sunny Golloway's Sooners stave off elimination yet again.
They put four crooked numbers on the board, including a pair of three-run innings and a pair of four-run frames.
The Sooners trailed 3-0 heading into the fourth, and that's when things really changed.
Designated hitter Matt Oberste, who finished a ridiculous 4-for-4 with four RBI and four runs scored, ripped a two-run double to right center.
That cut the lead to 3-2 at the time.
Second baseman Jack Mayfield's RBI groundout moments later tied the game.
OU took the lead in the sixth with its second big inning.
Oberste's plated shortstop Caleb Bushyhead on his second double of the day to make it 4-3.
Then, right fielder Cody Reine--and more from him would come later in the game--gave OU a 5-3 advantage on a sacrifice fly.
Mayfield singled home Oberste, and left fielder Erik Ross doubled to move the lead to 7-3.
The next inning OU put up another four-spot, starting with Reine's fifth career homer at Davenport Field, a three-run bomb to right.
Next, third baseman Garrett Carey slammed one out to left and it was 11-3.
Appalachian State countered in the bottom half with three, but OU again came right back with three of its own.
Those came on Oberste's RBI single and Reine's two-run triple, extending it to the game's final margin at eight.
Pitcher Steven Bruce, appearing for the first time since May 5 at Oklahoma State, walked six but still gave up just three earned runs in 3 2/3 innings and earned the win out of relief. ASU starter Rob Marcello suffered the loss after surrendering five runs, four earned, on three hits and a walk.
Reine's (six) and Oberste (four) combined for 10 RBI for OU in the contest, while ASU left fielder Brandon Burris finished 3-for-6 with two runs scored.
The two get back to action at 7 p.m. in game two, and the winner takes the regional and berth to Columbia.
"We're gonna patch this thing up, we're gonna piece this thing together and see what we can do," Golloway said.
Drew Harrison (0-0, 2.89 ERA), who has appeared in just five games this year, will start for the Sooners, while Jeffrey Springs (2-0, 4.07 ERA) gets the ball in his 12th appearance for the Mountaineers.