LeBron James scored 27 points and had the last word with a heckling fan at courtside, as the Cleveland Cavaliers finished off the Atlanta Hawks 84-74 on Monday night to win the NBA second-round series in four straight games.

Delonte West and Mo Williams showed Cleveland isn't just a one-man team, hitting huge shots down the stretch as the Cavaliers managed to extend their NBA-record streak of double-digit play-off wins to eight in a row.

Cleveland, which also swept Detroit in the opening round, will face either Boston or Orlando in the Eastern Conference finals.

No matter the opponent, the Cavaliers will be a lot more rested.

The Celtics-Magic series is tied 2-2 and will last at least through tomorrow, while the top seed heads back to Ohio to relax for a few days before opening the next round at home.

After scoring 47 points in Game Three, James struggled with his jumper in this one. Still, he came through with the Cavaliers facing their first serious challenge of the playoffs.

Towering three-pointer

With the Cavaliers leading by just four, 66-62, James hit a towering three-pointer with 6-1/2 minutes to go, lingering at the arc to pose with his right hand extended toward the arena roof.

The Hawks were still hanging around, trailing 76-72, when James drove right past Zaza Pachulia and laid it in despite getting hacked. He tacked on the free throw to complete the three-point play with 2:03 remaining.

Finally, after drawing the usual double-team, James dished off to an open Williams, who sank the clinching three-pointer with 52 seconds left.

At Dallas, Dirk Nowitzki scored 19 of his 44 points in the fourth quarter, including a high-arching shot with 1:05 left, that put Dallas Mavericks ahead for good on their way to a 119-117 victory over Denver that extended this second-round series to a fifth game with the Nuggets leading 3-1.

Carmelo Anthony scored a career playoff-best 41 points and hit a three-pointer with 3.1 seconds left from nearly the exact spot as his winning basket in the previous game, only this time it left Denver a point short of a tie.