Boston Celtics forward Kevin Garnett drives for a layup between New York Knicks forwards Amar'e Stoudemire (L) and Shawne Williams (R) in the fourth quarter of Game 4 of their NBA Eastern Conference playoff basketball game at Madison Square Garden in New York April 24, 2011. [Photo/Agencies]

NEW YORK - The Boston Celtics swept their way into the Eastern Conference semifinals, holding on for a 101-89 victory over the New York Knicks on Sunday.

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Kevin Garnett had 26 points and 10 rebounds, Rajon Rondo added 21 points and 12 assists for the Celtics, the first team into the second round after sweeping a series for the first time since a 3-0 victory over Indiana in 1992.

They had a 23-point lead cut to four in the fourth quarter, but pulled away again behind Garnett, who scored 20 after halftime.

The Celtics could now have a week off while they wait for likely second-round opponent Miami, which was forced to a fifth game earlier Sunday after a late rally by Philadelphia.

Carmelo Anthony had 32 points and nine rebounds for the Knicks, and Amare Stoudemire, who decided to play after his back felt better, finished with 19 points and 12 boards but shot only 5 of 20 from the field.

The Knicks shot 34 percent and were quickly dispatched in their first playoff appearance since 2004, when they were also swept in the first round. They haven't won a playoff game in 10 years. 76ers 86, Heat 82=

At Philadelphia, Lou Williams hit a 3-pointer with 8.1 seconds left to lead Philadelphia over Miami and avoid a series sweep.

Jrue Holiday made a 3 with 46.6 seconds to get the 76ers to within one point, before Williams shot from the top of the arc gave the home team the lead.

Game 5 is Wednesday in Miami.

Williams and Evan Turner led the Sixers with 17 points each. Andre Iguodala added 16 points and Elton Brand had 15 points and 11 rebounds.

LeBron James scored 31 points for the Heat and Dwyane Wade 22.    Hawks 88, Magic 85=

At Atlanta, Jamal Crawford scored 25 points and Joe Johnson hit four big free throws in the final 20 seconds to lead the Hawks to victory and a 3-1 lead over the Magic in their Eastern Conference playoff series.

The Hawks will try to wrap up the best-of-seven series Tuesday night in Orlando.

Atlanta made only 12 of 20 free throws, but Johnson came through when the Magic were forced to foul. Orlando had a last chance to tie it up, but Al Horford knocked the ball away from Hedo Turkoglu as he tried to get loose for a 3-pointer.

Turkoglu got the ball back with only enough time to force one up. It missed badly, and the Hawks celebrated a commanding series lead.