CARACAS, Venezuela -- Lauren Lappin had three hits and four RBI and Jennie Finch picked up the victory as the United States beat Botswana 21-0 in a game that was stopped after three innings Saturday at the world softball championships.
The Americans will have a tougher time on Sunday against Australia, which is expected to challenge Japan and the U.S. for the title.
Olympic champion Japan defeated Cuba 1-0 after a rain delay to remain unbeaten after four games.
Japan has allowed only one run at the tournament and is a favorite to challenge the United States, which has won six straight titles. The championship ends July 2.
Sayuri Yamane went the distance and got the victory, giving up only three hits. Japan also managed only three hits. Japan scored its only run in the bottom of the second when Naoko Matsumoto doubled to score Misato Kiwano.
Canada also improved to 4-0, beating England 7-0 and Argentina 12-0 in a game that was postponed by rain on Friday.
The Netherlands improved to 3-1, beating Argentina 4-3 and Cuba 3-1.
In other results Saturday on a day filled with rain delays, Australia blanked the Czech Republic 6-0 and China trounced New Zealand 11-0.