SOUTH WILLIAMSPORT, Pa. -- Brad Stone hit a grand slam in the first inning and Las Vegas hit five home runs in a 13-2 win over Chicago's Jackie Robinson West on Sunday.
First baseman Austin Kryszczuk homered twice, in the second and fourth innings.
Chicago's Pierce Jones, who hit three home runs on Thursday, went 0-for-2 with a walk.
Jun Hyeok Yun stole home to score the go-ahead run and South Korea beat Puerto Rico 8-5.
Entering as a pinch runner, Yun raced home after teammate Hae Chan Choi drew a throw to second base from catcher Jeremy Colon in the top of the sixth. South Korea added two runs later in the inning and Jae Yeong Kim pitched a perfect bottom half of the inning.
Awaiting South Korea on Wednesday is Japan.
Shozo Kamata had a pinch-hit, go-ahead two-run single in the fifth inning to help Tokyo, Japan, beat Guadalupe, Mexico, 9-5.
With the game tied at 5, Kamata hit a slow ground ball up the middle that escaped the reach of Mexico's shortstop and second baseman and made the score 7-5.
Japan added two more in the inning and Mexico could not respond, going down in order in the top of the sixth.
Japan advances to play Seoul, South Korea, on Wednesday.
Information from The Associated Press was used in this report.