The Red Sox outfielder fended off 13 pitches during the exchange, before belting a grand slam in the 6-4 win Thursday at Fenway Park in Boston. The swat put the Red Sox ahead 5-2 in the bottom of the fourth inning.
Teoscar Hernandez put the Blue Jays up 2-0 with a two-run shot in the first frame. Any Leon plated Xander Bogaerts on a ground out in the fourth inning, before Betts walked up to the plate with the bases loaded.
Betts took a called strike from Blue Jays starter J.A. Haps before taking a 94-mph fastball for a ball. He then swung and missed on a 94.2-mph fastball. Then the foul-offs began. Betts got a piece of six consecutive offerings, sending them for foul balls in order to stay alive.
Happ tossed a ball in the dirt, before Betts fouled off his 11th offering. Happ's 12th pitch of the exchange also went in the dirt for a ball, pushing the count full.
The southpaw grooved in a 95.2-mph fastball for his final offering of the exchange. Betts hacked away at the low pitch, sending it over the Green Monster in left field for a 407-foot grand slam. The ball left the field at 108.3 mph, according to Statcast.
Betts, 25, went 2-for-4, with five RBIs and a run scored in the win. He is hitting a league-best .352, with 23 home runs and 49 RBIs this season.