TORONTO — The Golden State Warriors relied on a champion’s heart to overcome their weary bodies.

Klay Thompson scored 25 points before leaving with a hamstring injury, Stephen Curry had 23 and the Warriors ran off the first 18 points of the second half on the way to a 109-104 victory over the Toronto Raptors on Sunday night that tied the NBA Finals at one game apiece.

With Kevin Durant already out and Thompson eventually joining him in the fourth quarter, the Warriors don’t feel great — but they would’ve felt a whole lot worse flying home in a 2-0 hole.

“I think that when you get to this stage, our DNA shows up,” Curry said.

Andre Iguodala, himself slow to get up after a hard fall in the first half, made the clinching 3-pointer with 5.9 seconds left after the Raptors scored 10 straight points to cut it to 106-104.

Kawhi Leonard had 34 points and 14 rebounds for the Raptors. They had won five straight since falling behind 2-0 in the Eastern Conference finals.

DeMarcus Cousins was inserted into the starting lineup and delivered 11 points, 10 rebounds and six assists, and Draymond Green had 17 points, 10 rebounds and nine assists — missing by one assist a fourth straight triple-double.

The series moves to their Oracle Arena for Games 3 and 4, with the first NBA Finals to be played outside the U.S. assured of returning to Canada for Game 5.

The Warriors will hope to have enough healthy bodies to get through it. Thompson landed awkwardly after a 3-point attempt early in the fourth quarter and limped off soon after, with backup center Kevon Looney already missing the second half with a chest or shoulder injury.

And Golden State is still without Durant, who missed his seventh straight game with a strained right calf but hopes to return during the series.

Kerr said Thompson told him that he thought his injury was minor and he’d be fine, but added that “Klay could be half dead and he would say he would be fine.” Kerr was unsure the nature of Looney’s injury.

The Warriors had won 12 straight Game 1s and this was their first time playing from behind in the finals since they were down 2-1 to Cleveland in 2015. They showed no signs of concern during the off days, and Thompson suggested part of the problem during their 118-109 loss Thursday was rust after they had nine days off in between series.

Their bigger problem early in Game 2 was the defense of the Raptors. But Toronto — which had a 23-0 advantage in second-chance points — missed a chance to take a comfortable lead into the half and couldn’t overcome its 37 percent shooting, with Pascal Siakam going 5 for 18 for 12 points after scoring 32 in the opener.

UP NEXT — Golden State hosts Game 3 on Wednesday night.