COLUMBIA, S.C. — Ann Marie Topps hit a three-run home run and Oregon beat South Carolina 8-4 Saturday in the NCAA South Carolina Regional.

COLUMBIA, S.C. — Ann Marie Topps hit a three-run home run and Oregon beat South Carolina 8-4 Saturday in the NCAA South Carolina Regional.

With two wins, Oregon (44-17) will play today in the regional championship game against an opponent determined by Saturday's late games at Beckham Field between South Carolina, Penn State or NC State.

Alicia Cook (23-4) allowed four runs on 12 hits for the win. It was her 22nd complete game of the year.

Topps' 19th homer of the season gave the Ducks a 5-1 lead in the fifth.

Lindsay Walker hit a two-run single for South Carolina (35-24). Melissa Hendon (18-17) took the loss after allowing eight runs on 12 hits.

The tournament format is double elimination with the winner of each regional advancing to the super-regional — a best of two out of three game series. The eight super-regional winners advance to the World Series in Oklahoma City.

The Ducks are making their fourth postseason appearance in the last five years under head coach Kathy Arendsen.

Oregon State 11, Louisville 4

At Ann Arbor, Mich., pitcher Brianne McGowan homered twice and drove in six runs, and got a complete game win as Oregon State beat Louisville in the NCAA softball Ann Arbor Regional.

Earlier in the day, Oregon State (41-22) defeated Eastern Michigan 6-1. The Beavers will face Michigan today for the chance to advance to the Super Regionals.

McGowan (25-23) hit a two-run home run in the first and added a solo homer in the sixth. She allowed four runs on 10 hits with 10 strikeouts over seven innings.

Louisville (37-25) was eliminated. Catherine Bishop allowed seven runs on eight hits over 21/3 innings for the loss.

Earlier Saturday, sophomore DeAnn Young drove in four runs against Eastern Michigan.

Eastern Michigan (27-22) was eliminated.

Young hit a two-run home run in the third for the No. 15 Beavers. She added a two-run double in the seventh.

McGowan allowed one run on four hits over 52/3 innings in relief.

Aimee Woodrum (12-9) allowed three runs on five hits over four innings for the loss.

The Beavers were making their ninth straight trip to the postseason. Last season they advanced to the Women's College World Series for the first time.

The winners of each regional head to the Super Regionals on Memorial Day weekend for a chance to head to the World Series in Oklahoma City.