They were both promptly ejected from the court.
Ibaka went to the floor after the two were battling for position under Cleveland's basket as the Raptors attempted a full-court pass that sailed out of bounds. The two locked arms and Ibaka fell as Chriss walked by while mouthing something to the Congolese big man.
Ibaka was the instigator in the fight, throwing several punches at Chriss. Ibaka immediately headed for the locker room and both players were kicked out after the officials conferred. Ibaka isn't new to exchanging punches with opponents.
The lowly Cavs actually wound up blowing out the 48-20 Raptors, winning 126-101.
Neither player was available for comment following the game.
Leonard scored 25 points after sitting out Sunday's game, but the team with the league's second-best record trailed most of the way.
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Monday wasn't Ibaka's first National Basketball Association fight.
Cedi Osman added 19 points, seven rebounds and seven assists.
Despite a less-than-stellar performance in the first 24 minutes, the Raptors entered the half down just four points.
The Cavs would lead by no less than nine points the rest of the way - extending their edge to as much as 27 points late in the fourth quarter.
The Raptors, showing signs of being exhausted in their third straight road game, struggled throughout the game.
The Cavaliers connected on six 3-pointers in the third quarter and made 18 of 41 for the game.
By the Numbers - 13 ... straight games that the Cavaliers have drilled double-digit three-pointers - dating back to February 8 - averaging 15.1 threes per contest over that span.