Mullins' third career five-hit performance fueled the Orioles to a sweep of the three-game series
Each team scored once in the 10th inning before Baltimore erupted in the 11th.
Muilins singled home automatic runner Jorge Mateo in the 10th against Nate Pearson. Mullins, however, was caught stealing on a strikeout to complete a double play.
Whit Merrifield's one-out single against Baltimore's Austin Voth scored automatic runner Daulton Varsho in the bottom of the 10th. Mike Baumann (3-0) replaced Voth and picked off Merrifield at first base.
In the 11th, Yimi Garcia (1-2) allowed Adam Frazier's one-out single that moved automatic runner Ryan McKenna to third before Austin Hays hit an RBI single. Gunnar Henderson singled to load the bases and pinch hitter Terrin Vavra hit a two-run single before Mullins added a two-run double.
Baumann pitched a 1-2-3 bottom of the 11th to seal the win.
Matt Chapman hit a solo home run for Toronto.
Toronto right-hander Kevin Gausman allowed two runs, six hits and two walks in eight innings.
Baltimore right-hander Dean Kremer allowed one run, nine hits and two walks in 5 1/3 innings. He matched his career best with seven strikeouts.
Chapman led off the second with his sixth homer of the season.
The Orioles' Joey Ortiz led off the third with a double. He took third on a single by Mullins, who stole second. Ortiz scored on Adley Rutschman's groundout to second. Mullins scored from third, beating the throw home on Anthony Santander's grounder to first
Kremer pitched around two singles in the bottom of the fourth, including the first career major-league hit by Nathan Lukes.
Chapman walked to lead off the home sixth and took second on Alejandro Kirk's one-out single, Cionel Perez replaced Kremer and after walking pinch hitter Danny Jansen to load the bases, coaxed a double-play grounder from Kevin Kiermaier to end the threat.
Mychal Givens, activated from the Baltimore injured list for the game, walked George Springer to open the seventh, then Bo Bichette singled. The runners advanced to second and third on a groundout to the pitcher, and Brandon Belt was intentionally walked. Chapman hit a sacrifice fly for a 2-all game.
--Field Level Media