With their backs against the wall and hopes of repeating as champions fading, the Miami Heat’s Big Three used a dominating performance to beat the San Antonio Spurs 109-93 on Thursday and even the NBA Finals at 2-2.

LeBron James, Dwyane Wade and Chris Bosh had their best game of the NBA Finals, combining for 85 points as the Heat reclaimed home-court advantage in the best-of-seven series.

Wade turned in his biggest offensive performance of the playoffs, scoring 32 points, while Bosh equalled his postseason high by chipping in with 20 points and 13 rebounds.

Tim Duncan scored a team-high 20 points while Tony Parker shrugged off a mild hamstring strain suffered in the previous game to score 15 points on 7-of-16 shooting for the Spurs, but the home side were left chasing shadows for most of the contest.

Game Five is in San Antonio on Sunday before the teams return to Miami for Game Six and a series decider if necessary. Miami controlled the early exchanges and appeared set to take a comfortable lead into halftime but San Antonio's Boris Diaw came off the bench to spark an 11-2 run late in the second quarter to tie the game at 49-49 by the interval.

Leading by 11 points with six minutes to play, the defending champions started to pull away, aided by nine points down the stretch from James, who had shouldered much of the blame for the Heat's 36-point loss in the previous contest.

James had repeatedly vowed he would be back to his best for Game Four and despite a relatively quiet start, he managed to carry his team when it mattered most.  San Antonio’s trio of Gary Neal, Danny Green and Kawhi Leonard, who combined for 65 points in the Game Three victory, could only contribute 35 points between them on Thursday.

The Spurs were largely undone by turnovers, giving the ball up 18 times and failing to contain James, Wade and Bosh the way they did in Game Three when the All Star trio were limited to 43 points in Miami's 113-77 loss.