OG Anunoby's winning basket beat the final buzzer as the Toronto Raptors ended the Boston Celtics' winning playoffs run with a 104-103 win on Thursday.
Anunoby's three-pointer came off an inbound pass from Kyle Lowry with 0.5 seconds remaining, ending the Celtics' seven-game winning streak in the playoffs.
The defending champions narrowed the lead to 2-1 in their Eastern Conference semi-final series, with Lowry leading all scorers with 31 points.
Fred VanVleet added 25 and Anunoby had 12 points and 10 rebounds as the Raptors bounced back from opening defeats in the best-of-seven series.
Kemba Walker had 29 points and Jaylen Brown scored 19 with 12 rebounds for the Celtics.
Boston appeared headed for a 3-0 series lead after Daniel Theis slammed home an emphatic dunk for a 103-101 edge with a half-second to go.
The Raptors called timeout and Lowry fired the inbound over Tacko Fall to Anunoby, who was wide open on the far side of the court.
Anunoby connected on his shot to complete the comeback win.
The Raptors' largest lead of the fourth was 95-91 with 5:57 remaining before an 8-0 Celtics run that set up the finish.
Meanwhile, Kawhi Leonard scored 29 points as the Los Angeles Clippers rolled past the Denver Nuggets 120-97 to take Game 1 of the Western Conference semi-finals.
Paul George scored 19 points and Marcus Morris added 18. The Clippers shot 57 per cent from the field.
Nikola Jokic scored 15 points for the Nuggets, who were coming off a seven-game series with Utah that ended on Tuesday.
Jamal Murray, who averaged 31.6 points in the first round and scored at least 50 points twice in that series, finished with just 12 points on five-for-15 shooting. Denver shot just 42 per cent.
The Clippers took charge in the second quarter, outscoring the Nuggets 38-20 to take a 69-51 lead at halftime. Los Angeles held Denver to 25 per cent shooting into the second quarter.
The Clippers continued to dominate in the third quarter, holding the Nuggets to 16 points in the period and taking a 91-67 lead into the fourth.
Los Angeles' biggest lead in the quarter was 29 points.