Fraser, a former Toronto assistant coach, had won three straight matches since taking charge of the Rapids Aug. 25.
Toronto FC (12-10-9, 45 points) extended an unbeaten run to seven matches and moved up to fourth place in the Eastern Conference, ahead of D.C. United on a tiebreaker. The Rapids (10-15-6, 36 points) suffered a blow to their already slim hopes of reaching the MLS Cup playoffs.
Returning home from a 1-1 draw against New York City FC at Yankee Stadium Wednesday, Toronto FC roared out of the gate and led 2-0 after just 13 minutes. Tsubasa Endoh opened the scoring in the 8th minute. After Richie Laryea was played into the box by Jozy Altidore, he cut the ball back to Endoh, who hammered his shot in off the crossbar.
Five minutes later, Alejandro Pozuelo doubled the advantage from the penalty spot after Lalas Abubakar pulled back Altidore in the box. Pozuelo, who went 1-for-2 from the penalty spot in the Bronx Wednesday night, made no mistake with his panenka.
Just when it looked like the rout was on, Keegan Rosenberry pulled the Rapids back a goal in the 31st minute, following his initial shot that was blocked by Michael Bradley to beat Quentin Westberg. After taking down Sam Nicholson inside the box, Westberg atoned for his mistake with a diving stop on Kei Kamara’s penalty just before halftime.
Nicholson, who helped setup Rosenberry’s goal, then leveled in the 62nd minute, sliding in front to meet Rosenberry’s lofted cross. However, the final heroics came from Osorio, who came off the bench for the injured Nicolas Benezet, clipped an Erickson Gallardo pass over Clint Irwin and into the net for the winner.
Sep 15, 2019; Toronto, Ontario, CAN; Colorado Rapids forward Andre Shinyashiki (99) keeps the ball away from Toronto FC midfielder Tsubasa Endoh (31) and midfielder Michael Bradley (4) at BMO Field. Mandatory Credit: John E. Sokolowski-USA TODAY Sports
— The Associated Press contributed to this story