The Cavaliers left no doubt on their way to Round 2 — and finished off the most lopsided series in NBA playoff history.

Donovan Mitchell scored 22 points, De’Andre Hunter added 19 and the Cavaliers rolled past the Heat 138-83 on Monday night in Miami to sweep their first-round Eastern Conference series in four games.

Ty Jerome had 18 points, Evan Mobley added 17 and Jarrett Allen had 14 points, 12 rebounds and six steals for the top-seeded Cavaliers — who led by as many as 60 points.

The Cavs won the four games by a combined 122 points. The previous record: a 121-point combined win by the Nuggets over New Orleans Hornets in 2009.

The 55-point margin in Game 4 was the fourth-biggest playoff win ever. The record for biggest playoff win is 58 points, done twice: Minneapolis over St. Louis in 1956 and the Nuggets over the New Orleans Hornets in 2009. The Lakers beat the Warriors by 56 points in 1973.

The Cavs came close. Pelle Larsson kept the eighth-seeded Heat from that piece of ignominious history. He made a 3-pointer to cut the Cavaliers’ lead to 55 with about 38 seconds remaining.

Nikola Jovic led the Heat with 24 points.

The Cavaliers will play either the Pacers or Bucks in the East semifinals.

The Pacers lead that series 3-1.

Lillard tears Achilles: Damian Lillard has a torn left Achilles tendon, confirming the Bucks’ worst fears after the seven-time all-NBA guard was helped off the court Sunday night.

The Bucks announced details of Lillard’s injury after an MRI on Monday.

The injury knocks Lillard out for the rest of the postseason and could put his status for next season in doubt. When Kevin Durant tore his Achilles tendon in the 2019 NBA Finals, he also missed the following season.

The Bucks had been bracing for this outcome after their 129-103 home loss to the Pacers in Game 4.

Lillard’s injury occurred in his third game since coming back after a 15-game absence from deep vein thrombosis in his right calf.

“This is a tough one,” Bucks coach Doc Rivers said after Sunday’s game. “Blood clot, followed by this. It’s just tough. That’s why you have teammates and family around him. He’s just such a great freaking dude, on a basketball level, but more importantly as a teammate and a father and all that stuff.”

Lillard, 34, was behind the 3-point line around the top of the key midway through the first quarter when the ball bounced toward him. Lillard used his left hand to tip the ball toward teammate Gary Trent Jr., then went down and grabbed his left leg.

When Lillard got up, he couldn’t put weight on the leg. He eventually was helped off the court and into the locker room.

“He’s one of the toughest guys I know, so when he stays down, you feel for him,” said teammate Pat Connaughton, who played with Lillard on the Trail Blazers as well.

Lillard ranked 10th in the NBA in scoring (24.9) and 10th in assists (7.1) this season while earning his 10th All-Star selection.