Tennessee ace Karlyn Pickens carried her team across the finish line, and the Volunteers handed Oklahoma its first series defeat of the season with a 5-3 victory. The No. 2-ranked Sooners were unable to cash in on Abigale Dayton’s leadoff walk in the fifth or her two-out single in the seventh.

OU dropped its series finale against No. 10 Tennessee on Sunday, 5-3, and dropped a Southeastern Conference series for the first time in school history. The Sooners had beaten South Carolina, Arkansas and Missouri in its first three SEC sets.

Oklahoma softball knew it had a challenge ahead when reigning SEC Pitcher of the Year Karlyn Pickens rolled into town. In last week’s Lady Vols' win over Arkansas, Pickens set the record for fastest-recorded pitch in softball history when she was clocked at 78.

With the victory, the Lady Vols clinched the series against Oklahoma, who went 2-for-12 with runners in scoring position. Oklahoma lost an SEC series for the first time in program history. Oklahoma led,

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The second-ranked Oklahoma softball team was done in by a former Sooner in its series opener against Tennessee.