Victory or Defeat in Game 7, the Boston Celtics have already won

LeBron James and Jayson Tatum

LeBron James' Cleveland Cavaliers have pulled off a major upset knocking out favourites Boston Celtics in game seven at TD Garden to secure a fourth straight Eastern Conference championship for the club.

Brad Stevens says that "it's an absolute blast" to prepare for Game 7, especially up against a "tremendous individual player" in LeBron James.

LeBron James has earned a spot in his eighth consecutive National Basketball Association finals after leading the Cleveland Cavaliers to a thrilling series victory over the Boston Celtics.

Tatum rose to the occasion for 24 points and seven rebounds before fouling out with 40.5 seconds remaining in a 10-point game, then shared a long embrace with James after the game. She posted congrats to James after he won his first championship with the Heat back in 2012, and followed him without question to Cleveland when he chose to head back to his hometown.

This might be his weakest supporting cast year. They still can surrender open shots everywhere, a flaw that seems fatal against the 3-point happy Rockets or Warriors.

And, after all, the Horford-driven Celtics did come very close to knocking off LeBron and making the damn NBA Finals.

"I know I get a lot of the headlines but in order to be successful it's a team game, I learnt that". But whatever the next chapter brings, James will have owned the Celtics in a fashion few other players in history ever did.

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"It was Game 7 in Boston", said Cavs coach Tyronn Lue. "I thought that added to probably the shooting the rest of the game". It's ridiculous, and he does it at this level and with the pressure, with the scrutiny.

But Jeff Green, elevated to a starting role due to Love's injury, hit one of his two 3-pointers, and James fed Tristan Thompson the next trip down as the Cavaliers went back up four. If he's just at home chilling or somewhere not important, to me, that's a problem. Al Horford added 17 points and Marcus Morris had a double-double with 14 points and 12 boards.

James believes that they can outhustle, outsmart and out coach whoever they face in the final.

Lue said of the Cavs winning without Love: "We told the guys that Kevin wasn't coming back, and they all got together and just huddled up and just came together as one, and coming into tonight, we knew he was going to be out, and we said we want to do this for Kevin".

This will not be an easy task for James and his buddies, who will try to hand the Celtics their only loss in 11 postseason home games. "I'm the leader of this team, and I'm going to give what I've got", he said.

Perhaps it was Boston's lack of urgency and Cleveland's desperation that led the Cavaliers to a gritty 87-79 victory on Sunday night. The Boston Celtics' star point guard is hurt and has been out since the end of the regular season, but he's typically still been on the bench, cheering on his teammates.