Gio Gonzalez gave Team USA its best start yet, and David Wright provided a big finish.
Gonzalez pitched five scoreless innings and the Americans beat Puerto Rico 7-1 in the World Baseball Classic on Tuesday night.
Wright drove in five runs, the last three with a bases-loaded double in the eighth. That prompted chants of "U-S-A! U-S-A!" from the crowd of 32,872.
The United States fell behind in all three games in the opening round, but led from the first inning against Puerto Rico. The Americans will play Thursday night against the Dominican Republic, which remained unbeaten in the WBC by rallying past Italy 5-4 on Tuesday.