After taking a 2-0 lead in their Eastern Conference Finals series with the Cleveland Cavaliers, the Boston Celtics produced one of their worst performances of the season in Game 3.

The Celtics were obliterated by 30 points in a 116-86 loss at Quicken Loans Arena and once again looked like a completely different team on the road.

They are a perfect 9-0 at home but now just 1-5 on their travels as they've become the ultimate Jekyll and Hyde team in the playoffs.

With home-court advantage, they can advance to the NBA Finals just by winning all of their games at TD Garden against the Cavs but that won't be the case if they go on to face either the Golden State Warriors or Houston Rockets.

Their road struggles have given the Cavaliers a way back into the series and a belief that they can even things up in Game 4 on Monday night.

But Marcus Morris has promised that we'll be seeing a completely different Celtics team compared to the last game.

"That team we saw yesterday, I'm 100 percent sure it won't be the same team on Monday," Morris said, per CBS Sports.

The power forward was extremely critical of his own display on the night and admitted he did a bad job of defending LeBron James despite previously claiming that he's the second-best player at guarding him.

"Personally, I think I did a s--- job defensively with LeBron. He was too comfortable when I was guarding him," he said.

Jaylen Brown, who led the C's in scoring in the opening two games, was held to just 10 points on 3-of-8 shooting in an off night for him.

He described the display as "embarrassing" but he expects to use that disappointment as motivation to bounce back in a crucial Game 4.

"I use it as fuel because I thought it was embarrassing," Brown said. "I thought we came out, the way I played, the way I performed, how not aggressive I was in the first half, I look at that as fuel to come out in Game 4 and be excited about it and be ready to play and ready to fight."

But the momentum is now with Cleveland and they'll be extremely confident in levelling the series up at 2-2 after putting together their best game in the postseason.

There are certainly more twists and turns to come but the outcome of the next encounter could go some way to determining who will win the series.

Listen HERE to episode two of the new GiveMeSport NBA podcast, featuring New York Times senior writer Marc Stein.

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