Leonard top-scored for the visitors at the Oracle Arena and was one of six to make double figures, with key contributions from Kyle Lowry (23) and Pascal Siakam (18).
The Warriors only led for less than 20 seconds throughout the whole game, with the Raptors amassing a 36-29 lead in the first quarter and pushing on for the win.
Siakam: 18 PTS, 9 REBCurry: 47 PTS, 6 3PM pic.twitter.com/CfDWJr3LpQ
— NBA (@NBA) June 6, 2019
Stephen Curry scored 47 points for the Warriors, with only Draymond Green (17) and Andre Iguodala (11) reaching double figures for Golden State.
The fourth game of the best-of-seven series takes place in California on Friday.