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Arkansas' Brian Anderson (1) is tagged out at second base by South Carolina shortstop Joey Pankake on a double play in the eighth inning of an NCAA College World Series baseball game in Omaha, Neb., Thursday, June 21, 2012. Bo Bigham was also out on the double play. (AP Photo/Dave Weaver)
Michael Roth of the Gamecocks threw a two-hitter against Kent State earlier in the day. South Carolina and Arkansas will play again Friday night to decide which team goes to the best-of-three finals.
The Gamecocks' runs came in the second inning on Tanner English's double and Chase Vergason's single.
Montgomery (6-1) struck out six and walked one in his first outing since June 3.
South Carolina is the third team in the 63-year history of the CWS to win two full games in the same day. The last to do it was Holy Cross in 1952, when it beat Western Michigan and Penn State en route to the title.