YOKOHAMA, Japan (AP) — Triston Casas hit his third home run of the Olympics and the United States beat the Dominican Republic 3-1 to stay in gold medal contention. Tyler Austin added a solo home run in the fifth and Scott Kazmir got the win. Casas' homer came off Boston Red Sox Double-A teammate Denyi Reyes. The U.S. plays next on Thursday night against defending South Korea for a berth in the gold medal game against Japan. The Dominicans will play Thursday night’s loser for the bronze medal.