Won a silver medal with at the Tokyo 2020 Olympic Games after being the lone member of Team USA to get a hit in every game of the tournament, finishing with a team-leading .417 batting average. He also led the team in doubles (3) and was second on the team in home runs (2) and RBIs (7). Austin led the team offensively with a 3-for-5 opening game against Israel to start off the Tokyo 2020 Olympic Games baseball tournament, finishing the opener with three extra-base hits with a home run and two doubles. He hit an RBI-single up the middle for some insurance in the sixth inning against Korea (4-2 victory), finishing the game 1-for-4. Austin went 2-for-5 with a double and a run scored in the quarterfinals against Japan, went 1-for-3 with a solo home run against the Dominican Republic, and continued his hot hitting in the tournament with a 2-for-4 day in the semis against Korea, coming through with a clutch two-RBI single to centerfield as part of a five-run sixth inning that pushed the U.S. into the gold medal game. In the gold medal game, Austin finished the game 1-for-3 with a walk.

Austin was named to the All-Olympic Team (designated hitter).