A victory in Cleveland would send the surprising Celtics to the NBA Finals for the 22nd time in franchise history while a loss means Game 7 at the TD Garden Sunday night.

Jim Fenton The Enterprise @JFenton_ent

BOSTON – The short video clip was shown over and over again during the spring and summer of 2010.

There was LeBron James exiting the court at the TD Garden on May 13, 2010, after his Cleveland Cavaliers had been eliminated in the second round by the Celtics.

James threw his headband into the stands, then took off his No. 23 jersey while walking down a corridor leading to the locker room, out of sight from the crowd.

It was a symbolic move by James, a message that he was finished with the Cavaliers, and it all became official nearly two months later when he joined the Miami Heat.

James and the Cavaliers were reunited in 2014 and he delivered a championship to Ohio in 2016, but now there are serious rumblings about another split about to take place.

The NBA’s best player can opt out of his contract this summer and potential landing spots have been in the rumor mill for months.

And here are the Celtics once again in a position to be the team that ends James’ stay in Cleveland.

With a victory in Game 6 Friday night at Quicken Loans Arena (8:30, TV: ESPN; radio: WBZ-FM/98.5), the Celtics will advance to the NBA Finals for the 22nd time in franchise history.

They own a 3-2 lead in the Eastern Conference finals in a series that has featured wins by just the home team. If the Celtics can alter that trend, they will stop James’ streak of 23 straight series wins over teams from the East, dating to 2010.

The Celtics, 1-6 on the road in the postseason, have enough to worry about without getting into the soap opera that is James and Cleveland. They are interested in moving on to the next task after getting the edge with a Game 5 win.

One more victory, and the surprising Celtics – minus Kyrie Irving and Gordon Hayward – will be opening the Finals next Thursday night in Oakland or Houston

“The deal is you can’t ride the emotional roller coaster,’’ said coach Brad Stevens during a conference call Thursday afternoon. “You can’t live or die with every loss or win.

“You just move on and you get ready for the next one and you play it as well as you can. I think one of the strengths of this team has been moving on. We’re going to have to move on from (Wednesday) night’s win, play better than we have. We’ve got a chance to win Game 6.’’

Rough starts in Games 3 and 4 in Cleveland prevented the Celtics from getting a road win earlier in the series, so they will be focused on being ready to go right from the start in Game 6.

“At the end of the day,’’ said Stevens, “it’s incredibly hard to beat a team in the NBA one time and our focus is on what we need to do to give us the best chance at being successful (Friday) night.’’

The Cavaliers were a different team in Game 5 than they were at home when the series became even last Saturday and Monday nights.

James looked weary at times and got little help from his teammates, which was not the case during the first two games in Cleveland.

“We have another opportunity on Friday to be as good as we can be, play Cavs basketball on our home floor and force a Game 7,’’ said James. “For me, I think I look forward to seeing us respond on Friday night. I know how well we’ve played at home in this postseason. That’s the only thing I can worry about right now.

 “I’m not worried about a Game 7. You can’t put yourself in that moment until you take care of the present.’’

In the present, the Cavaliers have been placed on the brink of elimination by a Celtics’ team that has overcome lots of adversity since opening night back in October.

One year after having an easy time with the Celtics in the conference finals when Irving was in Cleveland, the Cavs are trying to stay alive against them.

“I think they’re a very well-coached, well-balanced, hungry team,’’ said James. “They’ve got a bunch of young guys that were drafted very high and drafted very high for a reason because they can do multiple things.

“They can be aggressive offensively. They can defend. They can shoot. They can make plays for themselves and for others. This team is really good.’’

They are surprisingly good, given the fact that Hayward played less than one quarter and Irving’s season ended on March 11.

Yet one more victory is all the Celtics need from going to the Finals for the first time since losing to the Los Angeles Lakers in 2010, now long after ending James’ initial stay in Cleveland.

“We have a special opportunity,’’ said Terry Rozier. “We’ve got to come out fighting.’’