Puerto Rico scored the game's first run in the first inning on Aviles' single.
Japan starter Kenta Maeda, who took the loss, pitched five innings and gave up one run.
Rios, Aviles and San Francisco Giants outfielder Angel Pagan each had two hits for Puerto Rico. Ibata and Uchikawa had two hits apiece for Japan.
NOTES: Attendance was 33,683 at the 41,503-seat ballpark. ... No American-based major-leaguers were on Japan's roster, as the squad was filled with players from Nippon Professional Baseball. Infielder Kazuo Matsui was the only player with major league experience. ... The Netherlands knocked the Dominican Republic out of the 2009 WBC by upsetting the Dominicans twice in the first round. ... The Dominican Republic is 6-0 in this year's tournament, the only unbeaten team. ... The Dodgers and Toronto Blue Jays organizations had the most players involved in the WBC semifinals with five each. ... The Netherlands has some reinforcements for its game Monday, as Dodgers reliever Kenley Jansen and Texas Rangers shortstop Jurickson Profar were added as injury replacements.