Outfielder J.D. Martinez appeared to trip on second base while trotting out to right field at Nationals Park in the fifth inning. Martinez remained in the game defensively in the bottom of the fifth, but Jose Iglesias pinch hit for him in the top of the sixth.
Martinez apparently sprained his left ankle while tripping.
Iglesias singled in his at-bat and scored on a Christian Vazquez infield single, cutting Boston's deficit to 5-2.
It is unclear what the status of Martinez would be should the Red Sox fall to the Nationals and play in a tie-breaker for the American League Wild Card.
The 34-year-old Martinez has hit .286 with 28 home runs and 99 runs batted over 148 games in 2021.