Mahrley immediately fell down and was attended to by New York’s athletic training staff.
A medic came on the field and Mahrley was helped onto a stretcher as the crowd applauded.
When play resumed, crew chief Marvin Hudson took over behind the plate. Second base umpire Hunter Wendelstedt moved from second base to first base.
The 41-year-old Mahrley worked 473 games as a callup umpire until becoming a full-time umpire before last season.
The Yankees held a 4-3 lead when Mahrley exited.
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AP MLB: https://apnews.com/hub/mlb