Junior Lauren Chamberlain and senior Brittany Williams each hit home runs for Oklahoma, which scored two runs in the fourth, fifth and seventh innings each.
Martinez finished 3 for 5 with four RBIs, and Parsons was 3 for 4, scoring one of the runs on Martinez’s second-inning triple.
Tenth-seeded Tennessee advanced to the Super Regional with a 2-0 win over Lipscomb on Sunday.
Despite the Sooners’ championship series sweep last June, Tennessee began the season ranked No. 1. The Volunteers have reached the Women’s College World Series six times in the last nine seasons, while OU is seeking its fourth straight WCWS appearance.
“It’s exciting to think back to last year, but this is a brand new season and a different type of postseason for us,” Chamberlain said.