The Miami Marlins and the host Washington Nationals will play the finale of a five-game series on Monday night after splitting the first four games.
Both teams are relying on rookies more than usual in this odd coronavirus-affected season.
The Marlins, who had 18 players test positive for COVID-19 last month, have already used a franchise-record 33 pitchers this season, getting there in just 22 games.
Fourteen Marlins players have made their MLB debuts this season. Two of those debuts happened on Sunday as catcher Brian Navaretto went 2-for-3 and reliever Brandon Leibrandt pitched four scoreless innings.