The Sooners will face Tennessee in a best-of-three series beginning Monday night at 7 p.m. CT on ESPN2.
"I'm incredibly proud of this team," Oklahoma head coach Patty Gasso said. "Words can't express how excited we are to be here. Although our actions may not look like it, this is a very focused and determined team that had one goal and that is to get back and have a chance to win a national championship.
"It is difficult to do. It's been difficult this entire year. But the pride I have in this team is about their perseverance and the fact that they are not shaken by anything."
Like the first two games of the WCWS, the first two innings passed scoreless. But as they've done all Series, OU got on the board in the third.
The third inning started when senior Brianna Turang used a hard slap to drive the ball over left fielder Whitney Jones' head and then sped around the bases for her first triple of the season. Washington starter Kaitlin Inglesby then uncorked a wild pitch to the backstop allowing Turang to score.
"I just read the defense and I didn't necessarily try to hit it over her head," Turang said. "But I just tried to find a hole and do what I can to get on for Lauren Chamberlain to come up next."
After Turang showed off the team's speed, sophomore Lauren Chamberlain exhibited the team's power. She turned on a 2-0 pitch and crushed a solo home run to deep left field, her 29th of the season and 59th of her career.
The home run was her 82nd run driven in of the season, breaking a tie she shared with Samantha Ricketts (2007) for the most in a season in Big 12 and school history.
The power show continued two batters later when Ricketts hit a moon-shot to the bleachers in right center field. It was her 14th homer of the year and 49th of her career, breaking a tie with her sister Samantha for fourth in OU history and seventh in conference history.
"Any time right now that Brianna is coming up, it's almost a different version of what you feel when Lauren's coming up," Gasso said. "It just maybe won't go over the fence, but you're going to watch her run, and run fast. So her as a leadoff, finding a way to get herself to third base, and then here comes Lauren."
The three runs in the third proved to be enough for Ricketts. She improved to 34-1 on the year by striking out 12 -- her 15th game this year with 10 or more strikeouts -- and allowed just two runs, though only one was earned, on two hits and three walks.
OU added to its lead with another run in the fourth.
Senior Jessica Shults led off with a single to shortstop before being replaced on the bases by sophomore Erica Sampson. A sacrifice bunt moved Sampson to second before sophomore Callie Parsons walked. A groundout by Turang moved the runners up to second and third, and Chamberlain was intentionally walked to fill the bases.
Facing a full count, sophomore Georgia Casey drew the bases-loaded walk to bring home a run and make it 4-0.
Washington cut the lead in half in the fifth inning.
Kylee Lahners broke up Ricketts' no-hitter with a solo home run to center field to lead off the inning and pinch runner Mercedes Wetmore scored on a throwing error by sophomore third baseman Shelby Pendley.
Oklahoma got one of those runs back, though, in the sixth inning.
With two outs, Turang reached safely on an error by second baseman Kelli Seguro. Chamberlain then drew a walk to push Turang to second and Casey picked up her second RBI of the game as she blooped a single to left center field.
An insurance run came in the top of the seventh.
After Ricketts drew a walk, junior Brittany Williams hit a slow roller up the first base line. Standing behind the bag, Hooch Fagaly was in position to make the play, but the ball hit the base and kicked away allowing Williams to reach safely. Shults put down her first sacrifice bunt of the season to put the runners into scoring position before Destinee Martinez grounded out to second and Ricketts scored.