Won a silver medal with Team USA at the Tokyo 2020 Olympic Games, starting every game at shortstop and finishing the tournament tied for second on the team in batting average (.286). He opened the Olympic Games Tokyo 2020 with a 1-for-4 day, scoring the opening run of the Olympics for the red, white, and blue. Allen launched the first ball he saw with two outs in the sixth inning over the left field fence for the eventual game-winning run in a 4-2 victory over Korea in the Group B finale. He went 1-for-4 with an RBI-double in the quarterfinals against Japan and scored a run against Korea in the semifinals, coming home to score in a five-run sixth inning to push the U.S. into the gold medal game. Allen shined for the U.S. in the gold medal game, accounting for half of Team USA’s hits en route to a 3-for-4 (double) outing.

Allen was named the best defensive player in the Tokyo 2020 Olympic Games.

Allen started all four games at SS for Team USA at the WBSC Baseball Americas Qualifier, posting a perfect 1.000 fielding percentage and combining on a trio of double plays. He drove in the go-ahead run in the U.S.’s 8-6 win over the Dominican Republic that clinched a berth in the AOQ Super Round for Team USA.

He earned a gold medal with Team USA International Baseball Federation (IBAF) “AAA” World Cup in 2013, Allen hit .346 (9-for-26) with two doubles and a triple while leading the team with 13 runs scored.

Played in eight games and hit .250 (3-for-12) at the plate with one double to help the team secure the program’s first-ever gold medal at the 2013 COPABE Pan Am “AA” Championships.