Coach Brad Stevens reacted to a call.

Celtics beat Nets, 91-84

Rajon Rondo drove to the basket in between Shaun Livingston (left) and Paul Pierce.

Rajon Rondo drove to the basket in between Shaun Livingston (left) and former Celtic Paul Pierce.

Matthew J. Lee/Globe Staff | March 7, 2014

Kris Humphries looked for his shot under pressure from Mason Plumlee.

Kris Humphries looked for his shot under pressure from Mason Plumlee.

Matthew J. Lee/Globe Staff | March 7, 2014

Jeff Green blocked Deron Williams's shot with help from Jerryd Bayless.

Jeff Green blocked Deron Williams's shot with help from Jerryd Bayless.

Matthew J. Lee/Globe Staff | March 7, 2014

Jared Sullinger saved the ball from going out of bounds in second-quarter action.

Jared Sullinger saved the ball from going out of bounds in second-quarter action.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo threw a pass to Green under pressure from Livingston.

Rondo threw a pass to Green under pressure from Livingston.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo dribbled past Pierce.

Rondo dribbled past Pierce.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo had 20 points, 9 assists, and 7 rebounds in the game.

Rondo had 20 points, 9 assists, and 7 rebounds in the game.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo was helped to his feet after he was fouled by Pierce in the second quarter.

Rondo was helped to his feet after he was fouled by Pierce in the second quarter.

Matthew J. Lee/Globe Staff | March 7, 2014

Pierce was later fouled by Rondo in the fourth quarter.

Pierce was later fouled by Rondo in the fourth quarter.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo put defensive pressure on Joe Johnson in the third quarter.

Rondo put defensive pressure on Joe Johnson in the third quarter.

Matthew J. Lee/Globe Staff | March 7, 2014

Deron Williams drove to the basket past Rondo.

Deron Williams drove to the basket past Rondo.

Matthew J. Lee/Globe Staff | March 7, 2014

Rondo offered a spirited performance against Williams.

Rondo offered a spirited performance against Williams.

Matthew J. Lee/Globe Staff | March 7, 2014

Coach Brad Stevens reacted to a call.

Coach Brad Stevens reacted to a call.

Matthew J. Lee/Globe Staff | March 7, 2014

Stevens spoke with referee Gary Zielinski after multiple calls.

Stevens spoke with referee Gary Zielinski after multiple calls.

Matthew J. Lee/Globe Staff | March 7, 2014

Bayless knocked out a 3-pointer under pressure.

Bayless knocked out a 3-pointer under pressure.

Matthew J. Lee/Globe Staff | March 7, 2014

Bayless shot over Pierce and Marcus Thornton.

Bayless shot over Pierce and Marcus Thornton.

Matthew J. Lee/Globe Staff | March 7, 2014

Williams made a driving layup against Humphries.

Williams made a driving layup against Humphries.

Matthew J. Lee/Globe Staff | March 7, 2014

Pierce dribbled up the court behind Bayless.

Pierce dribbled up the court behind Bayless.

Matthew J. Lee/Globe Staff | March 7, 2014

Nets coach Jason Kidd watched his team falter against the Celtics.

Nets coach Jason Kidd watched his team falter against the Celtics.

Matthew J. Lee/Globe Staff | March 7, 2014

Boston MA 3/7/2014 The Brooklyn Nets head coach Jason Kidd giving advice to Shaun Livingston during third quarter action against the Boston Celtics at TD Garden on Friday March 7, 2014. (Matthew J. Lee/Globe staff) Topic: Celtics-Nets Reporter: Baxter Holmes

The Nets fell to the Celtics

Matthew J. Lee/Globe Staff | March 7, 2014

Pierce was introduced to the fans before the game.

Pierce was introduced to the fans before the game.

Matthew J. Lee/Globe Staff | March 7, 2014

Jason Collins, another former Celtics player, is seen in the background.

Jason Collins, another former Celtics player, is seen in the background.

Matthew J. Lee/Globe Staff | March 7, 2014

Williams (from left), Pierce, and Collins smiled before playing the Celtics.

Williams (from left), Pierce, and Collins smiled before playing the Celtics.

Matthew J. Lee/Globe Staff | March 7, 2014