Lori Harrigan pitched a two-hitter and Sheila Cornell hit a two-run homer as the United States remained the only unbeaten team with a 4-0 victory over Taiwan at Columbus, Ga.
U.S. pitchers have allowed only one run in four games.
Harrigan struck out five and walked none against Taiwan (1-3).
Cornell homered to left field in the third inning. It was her second homer in three games and gave her a team-leading six runs batted in.
In other games, China beat Puerto Rico, 10-0, in five innings under the 10-run mercy rule, Australia defeated the Netherlands, 1-0, and Japan beat Canada, 4-0.