The Boston Red Sox have the most exciting prospect in baseball at the big league level right now. Boston made the decision to bring outfielder Roman Anthony up to the big leagues on Monday to replace injured outfielder Wilyer Abreu.

Boston promoted outfielder Roman Anthony, the No. 1 prospect in baseball.

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.