Starting pitcher Kelvin Rivas gave up just one hit in five innings to take the win for Puerto Rico.
Joshua Corea had two hits in three at-bats, including one home run. Corea drove in three runs. Victor Claudio had three hits in four at bats, including a double.
Puerto Rico, 1-0, now plays Canada Friday at noon.
EMEA will try to bounce back Thursday against Canada. Game time is 4 p.m.