LOS ANGELES (AFP) - The Cleveland Cavaliers maintained their 100 per cent post-season record this season on Tuesday with a crushing 115-84 defeat of the weary Toronto Raptors to take a 1-0 lead in the National Basketball Association Eastern Conference finals.

Kyrie Irving scored 27 points while LeBron James added 24 as the Cavaliers dominated almost from start to finish to the delight of their home fans at the Quicken Loans Arena.

The 31-point rout was Cleveland's biggest ever victory in a play-off game.

The Cavaliers went into the game well-rested after wrapping up back-to-back 4-0 sweeps in their opening two post-season series.

Toronto by contrast had been forced to make a quick turnaround after only clinching a 4-3 series victory over the Miami Heat in their conference semi-final on Sunday.

On the evidence of Game One, few would bet against James and the Cavaliers making short work of the Raptors.

James attributed the win to Cleveland's attention to detail.

"It's our preparation, every single day. We understand the moment that we're in and the guys are rising to that," he said. "The coach is doing a great job of giving us a game plan and we're just trying to go out and execute."