For four innings Oklahoma State’s Ruby Meylan and Utah’s Hailey Maestretti dominated each other’s teams. After Maestretti relented, Meylan rolled on, tossing a one-hitter as the No. 2 seeded Cowgirls (38-14) defeated the No. 7 Utes (35-20-1) in the quarterfinals of the Big 12 softball tournament on Thursday in Oklahoma City. OSU will face either No. 3 Arizona or No. 6 Arizona State in the semifinals on Friday at 7 p.m. The Wildcats and Sun Devils played after the end of OSU’s win over Utah. In the end, the Utes simply didn’t have an answer for Meylan, who has been on a tear for the past several weeks. OSU’s Big 12 Quarterfinal Win Oklahoma State head coach Kenny Gajewski. | NATHAN J. FISH/THE OKLAHOMAN / USA TODAY NETWORK via Imagn Images Meylan was named the Big 12 co-pitcher of the year on Wednesday. Entering the tournament she hadn’t lost a game since March 21.…