Anthony, the No. 1 prospect in baseball, was promoted on Monday night and instantly made his presence felt in a tough extra-inning loss against the Tampa Bay Rays.

The Boston Red Sox announced Monday that outfielder Roman Anthony is being called up to the team.

The long-awaited move comes after Anthony launched the longest home run in an affiliated baseball game this season—a 497-foot grand slam for the WooSox on Saturday that left his bat at 115.6 mph.