What happened: Philadelphia Phillies second baseman Luis Arraez exited Thursday's 5-1 loss to the Milwaukee Brewers with a sprained left ankle. Arraez turned his ankle in the dirt while diving to avoid a tag from Jake Bauers on a wide throw by Cooper Pratt in the sixth inning. He required assistance to walk off the field and was unable to put weight on his left foot.

Why it matters: The injury threatens the availability of Philadelphia's top trade deadline acquisition just as the postseason approaches. Arraez currently leads the National League with a .310 overall batting average.

What to watch: The Phillies announced the initial diagnosis of a sprain. The organization will provide further updates on his status as they become available.