OU (17-4, 1-1 Big 12) dropped game two of the weekend series against the No. 11 Texas A&M Aggies 11-1 to even the series at one game apiece.
Wacha, who threw a complete game and struck out eight batters, kept the Sooners off the scoreboard through 6 2/3 innings while head coach Sunny Golloway went through four ineffective pitchers before finding a guy who could go an inning without allowing a run.
Freshman pitcher Dillon Overton lasted just two innings in his first career start during conference play. He had trouble getting batters out early in the inning as he let the first two batters of both innings get aboard.
Those early-inning woes led to three runs and an early exit for Overton, but he didn't get support from the bullpen to allow the offense to mount a comeback.
Senior pitcher Bobby Shore threw to three hitters in the third, and all three reached on singles before senior pitcher Tyson Seng took over.
Seng didn't do much better.
Although he was on the mound the longest of any OU pitcher, he gave up three runs before sophomore pitcher Ryan Gibson and freshman pitcher Cayle Shambaugh were called upon to eat up the final 3 1/3 innings.
Shambaugh had the only performance out of the bullpen Saturday that didn't result in a run.
The Aggies pounded OU pitchers for 19 hits, and every hitter but the last two in the order had at least two hits. Each batter but center fielder Krey Bratsen drove in at least one run.
By the time the Sooners got on the board, the Aggies had amassed an 11-0 lead going into the bottom of the seventh. OU's only run of the game came on a two-out single up the middle by junior shortstop Caleb Bushyhead.
He counted for almost half of the Sooners' seven hits by going three-for-three against Wacha.
"Today I worked on something a little different in the cage," said Bushyhead, who improved his batting average by .230 points Saturday. "It really clicked for me today. It's just working in the cage and just working to get better all the time."
The only other Sooner to have success against Wacha was junior third baseman Garrett Buechele. He collected two hits in four plate appearances.
The two-hit day was his 11th multi-hit game of the season.
The one-run performance marks the sixth straight game that OU has failed to reach the five-run plateau, and the Sooners are 2-4 during that span. The lack of hits and run production may result in shaking up the lineup to the point that regular starters may be seeing some time on the bench.
"I'm not quite sure what it's going to take for our guys to get going," said head coach Sunny Golloway. "We might have to use that bench as a measuring stick and get some guys out there that are going to play on character right now."
The rubber game of the series is slated for 1 p.m. Sunday at L. Dale Mitchell Park. Junior pitcher Burch Smith is scheduled to start for the Sooners.
He has a 2-1 record and 3.52 ERA in four starts.
"I think the fact that the series is even right now is something that we're extremely fortunate," Golloway said. "We still have a chance to win the series, and that's despite being really, really bad offensively right now."