The slap heard 'round the world struck Jake Paul on the left cheek Thursday night. Mike Tyson whipped his open-palmed right hand across Paul’s face at the weigh-in before their wild and weird and puzzling event.

Jake Paul and Mike Tyson are set to fight in a major professional boxing match tonight. Here's how to watch and what time the bout starts.

Paul and Tyson will fight in eight, two-minute rounds rather than the standard 10-12 rounds at three minutes each. There will also be a difference in the gloves worn. Both fighters will wear heavier 14-ounce gloves rather than the usual 10-ounce gloves.