The No. 15 OU softball team (33-13, 6-5 Big 12) conceded two extra-inning losses, 3-2 and 1-0, during pitching epics against Missouri this weekend in Columbia, Mo.

OU’s Keilani Ricketts and Missouri’s Chelsea Thomas engaged in pitching battles both days, each throwing a pair of complete games.

Ricketts, OU’s sophomore ace, allowed 12 hits Sunday — the most ever allowed by the San Jose, Calif., native — but missed opportunities and strikeouts kept the Tigers scoreless until the 11th.

Ricketts (20-9) threw 327 pitches in 20 innings, notching 29 strikeouts while allowing four runs from 21 hits against a potent Missouri offense.

Thomas (20-3) kept the Sooners scoreless through 11 innings Sunday, combining for 34 strikeouts while allowing just 13 hits in two games. Thomas, who suffered a stress fracture last season, threw 319 total pitches.

The teams combined for 20 innings of action over the weekend, playing into the ninth and 11th innings, respectively, in two matchups.

Missouri’s Abby Vock scored game-winning runs in both contests. Vock hit a walk-off home run — just her third homer this season — in the bottom of the ninth inning Saturday and scored the only run Sunday.

OU freshman Brittany Williams missed a scoring opportunity in the fifth when her shot to the wall bounced back into the park for a double, taking away a homer and the potential game-winning run for the Sooners.

Missouri (37-5- 9-1) also could have ended the game with the bases loaded in the sixth inning. Vock hit a shot that bounced off base runner Megan Christopher to record the second out of the inning, erasing the run scored on the play.

Senior third baseman Dani Dobbs made a big play to help the Sooners push the game into the 11th inning, stopping a Missouri hit on the third-base line and making the throw to first from her knees to record the second out in the bottom of the 10th.