Cops on Friday busted the brutal subway slasher who left a man bleeding at the Bryant Park station Thursday morning.

That’s when Michael McKenzie, 44, allegedly attacked Diab Ngjib, 38, with a boxcutter after the two men got into a fight on a northbound D train just after 10 a.m.

Their altercation came to a head as they pulled into the station at 42nd Street, where McKenzie repeatedly slashed and stabbed Ngjib, leaving him bleeding profusely from the face, chest, and hands, according to police reports.

The assailant was caught on camera fleeing the station and quickly identified, police said. Ngjib was stitched up at Bellevue Hospital.

McKenzie, who hails from Mount Hope in the Bronx, was arrested at his home Friday night and charged with assault