Not dead yet, the Cowgirls strung together four runs in the fifth, including doubles from second baseman Ari Morrison and third baseman Tiffany Mikkelson.
Stevens (32-7) looked to be in top form until that point. With the pressure on, she regrouped and escaped the inning.
“I definitely felt a little more urgency toward the end,” Stevens said. “Not so much I let down, but I picked it up a little bit after that. I wanted to get out of there.”
After a scoreless sixth, Freeman had a chance to win it for OSU with a runner on and two outs in the seventh.
Freeman belted a fly ball to deep left, but Townsend caught it at the warning track to end the game.
It was far from OU’s most glamorous win. Stevens said that makes it a fitting way to seal the conference title.
“That’s kind of what we have going for us,” she said. “They’ve not really seen us coming, but we’re really hot right now, and I think that’s going to be great going into postseason.”
OU and OSU play again at 2 p.m. Sunday in Norman.