The Sooners took game two and the series over TCU, winning 3-1 Saturday afternoon at L. Dale Mitchell Park.
"It wasn't 12 innings, but it's never easy," said OU head coach Sunny Golloway. "I think it speaks volumes to our conference, how tough every game is. I think our schedule up to this point has prepared us. We've had a reasonable amount of success, and we've had some failures that we got to learn from. It shows that we were prepared going into conference play."
For the second straight day, the Sooners took the early lead over the Horned Frogs when, in the third inning, right fielder Max White singled up the middle to bring home center fielder Craig Aikin and White later scored courtesy of a muffed throw, making it 2-0.
TCU cut the lead in half in the sixth on second baseman Derek Odell's sacrifice fly.
Given TCU's inability to move over and bring home runners, that was plenty enough to preserve a victory.
The Horned Frogs stranded 10 runners in the contest, allowing Sooner starter Dillon Overton to hurl mostly stress free despite surrendering seven hits en route to his one earned run.
He struck out four before exiting in the fifth with a blister on his hand on his way to improving to 6-1 this year.
Evans provided the most critical relief, inheriting a bases loaded situation in the eighth and fanning a batter, then forcing a flyout to escape unscathed.
"It's amazing," Golloway said. "We keep putting him in tough positions, and all he does is keep coming up big. We've got four starters who are freshmen, then we go to a freshman in Copping, then we close it with a freshman in Evans. I would challenge you to look around the country and tell me another top-25 program that's depending on six freshmen in a crucial conference series."
As low scoring as it was, the major storyline of the day was Oberste, who set the new school record with a 29-game hitting streak on his single through the right side in the bottom of the sixth.
Oberste surpassed former Sooner Marty Neff's previous record of 28 games.
"It's an honor and a privilege to be up there with that kind of group," Oberste said. "It's unfortunate that we can't put the whole team at the top of the list, because they helped just as much as I did."
The Sooners finished with just six hits in the contest, while TCU pounded out 11 hits but could only muster a single run out of them.
Horned Frogs starter Brandon Finnegan suffered the loss despite throwing a complete game with five strikeouts to three walks.
OU (21-4, 2-0 Big 12) will look for the series sweep and its 10th consecutive win when the two meet for the final time at 1 p.m. CT Sunday.