It's their eighth appearance all-time, including a National Championship in 2000, and a return off last year's heartbreaking loss in the title game to Alabama.
"Very proud of my team and what they've accomplished through the season to give us another chance to fight for a national championship," said OU head coach Patty Gasso. "Being one of the final eight teams in the country [is] quite an accomplishment."
The solo shot came in the first, the big bomb in the third, which put OU up 4-0, and they came on two different types of offerings.
"The first one was a rise ball, the second one was a drop ball," Pendley said of the two pitches she cranked."
An inning later, Pendley forced a bases-loaded walk for her fifth RBI of the game.
Ricketts, after settling down following an A&M first inning threat, finished it off with six outs in yet another complete game shutout.
"I feel like we were just focusing on giving them a good mix because they came out jumping, really aggressive in the first inning and jumping on pitches that I was trying to get ahead on the last game," Ricketts said. "And so we were just trying to give them a good mix every at bat."
Pendley, who finished with the five RBI, notched her sixth multi-homer game of the season while Ricketts finished with a pair of hits as the Sooners pounded out their eight runs on seven hits.
Ricketts moves to 31-1 on the year, while Aggies starter Mel Dumezich finishes at 27-10.
The Sooners will take on the winner of the Louisiana Lafayette-Michigan Super Regional in next Thursday's opening round of the WCWS.