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Gordon Hayward's ankle was reset on the court, according to ESPN.

What we know about Gordon Hayward’s injury

Hayward's 'gruesome' injury could be a season-ender

Gordon Hayward stretcher

Robyn Hayward on her husband's injury: 'I know he will come back stronger'

Isaiah Thomas and Gordon Hayward during the NBA All-Star Game skills competition in 2017.

Isaiah Thomas says Gordon Hayward due for a 'major comeback' October 18, 2017 | 10:16 AM

Bill Russell made his Celtics debut in 1956.

Bill Russell tells Gordon Hayward he is 'not alone' October 18, 2017 | 8:58 AM

Boston Celtics' Jayson Tatum (0) drives against Cleveland Cavaliers' LeBron James (23) in the first half of an NBA basketball game, Tuesday, Oct. 17, 2017, in Cleveland. The Cavaliers won 102-99. (AP Photo/Tony Dejak)

Jayson Tatum's stats from his NBA debut mirrored those of Larry Bird October 18, 2017 | 7:43 AM

Boston, MA: October 2, 2017: The Celtics Semi Ojeleye is pictured. The Boston Celtics hosted the Charlotte Hornets in a pre season NBA basketball game at the TD Garden. (Jim Davis/Globe Staff).

A Celtics rookie led the team through a prayer while Hayward received medical attention October 18, 2017 | 7:38 AM

Boston Celtics' Gordon Hayward grimaces in pain in the first half of an NBA basketball game against the Cleveland Cavaliers, Tuesday, Oct. 17, 2017, in Cleveland. Just five minutes into his Boston career, new Celtics star forward Gordon Hayward gruesomely broke his left ankle, an injury that may end his season. (AP Photo/Tony Dejak)

Here's what Celtics had to say following Gordon Hayward's grisly injury October 18, 2017 | 7:35 AM

CLEVELAND, OH - OCTOBER 17: Kyrie Irving #11 of the Boston Celtics reacts to his teammate Gordon Hayward #20 being injured while playing the Cleveland Cavaliers at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

A season of promise broken and unfixable October 18, 2017 | 1:58 AM

CLEVELAND, OH - OCTOBER 17: LeBron James #23 of the Cleveland Cavaliers and Kyrie Irving #11 of the Boston Celtics embrace after a Cavaliers 102-99 victory at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

Kyrie Irving's former teammates gave the ex-Cav some postgame love October 17, 2017 | 11:02 PM

Kyrie Irving drives past Cleveland Cavaliers' Iman Shumpert in the first half.

Kyrie Irving misses game-tying shot, Cavs hold off Celtics 102-99 in opener October 17, 2017 | 11:00 PM

CLEVELAND, OH - OCTOBER 17: Kyrie Irving #11 of the Boston Celtics reacts to his teammate Gordon Hayward #20 being injured while playing the Cleveland Cavaliers at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

The Cavaliers decided not to show a planned 'thank you' video for Kyrie Irving October 17, 2017 | 10:49 PM

CLEVELAND, OH - OCTOBER 17: LeBron James #23 of the Cleveland Cavaliers looks on while playing the Boston Celtics during the first half at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

LeBron James comforted an injured Hayward during his toughest moment October 17, 2017 | 10:38 PM

CLEVELAND, OH - OCTOBER 17: Kyrie Irving #11 of the Boston Celtics reacts to his teammate Gordon Hayward #20 being injured while playing the Cleveland Cavaliers at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

NBA players react to Gordon Hayward's gruesome injury October 17, 2017 | 10:06 PM

CLEVELAND, OH - OCTOBER 17: Gordon Hayward #20 of the Boston Celtics is sits on the floor after being injured while playing the Cleveland Cavaliers at Quicken Loans Arena on October 17, 2017 in Cleveland, Ohio. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Gregory Shamus/Getty Images)

Gordon Hayward left the Celtics' season opener with a fractured left ankle October 17, 2017 | 8:35 PM

Cleveland Cavaliers' Isaiah Thomas smiles during a news conference at the teams practice facility, Thursday, Sept. 7, 2017, in Independence, Ohio. (AP Photo/Tony Dejak)

Here what Kevin Garnett thinks about the Isaiah Thomas-Kyrie Irving matchup October 17, 2017 | 7:53 PM

FILE - This Sunday, Dec. 25, 2016 file photo shows Cleveland Cavaliers' LeBron James, left, and Golden State Warriors' Stephen Curry battling for a loose ball in the second half of an NBA basketball game, in Cleveland. The Warriors and Cavaliers are being penciled in to meet in the NBA Finals once again. They're going to drive most of the conversation this season, a fact that is not lost on the league or its TV partners. When the season tips off Tuesday, Cleveland will take the center stage first, followed by the Warriors. (AP Photo/Tony Dejak, File)

LeBron James will not have his minutes restricted in opener against Celtics October 17, 2017 | 7:07 PM

Paul Pierce and Jayson Tatum at a Celtics practice

What to know about the Paul Pierce-Jayson Tatum comparisons October 17, 2017 | 3:15 PM

Kyrie Irving and Al Horford won't have to face off as opponents anymore.

Rude welcome: Irving set for return to 'rowdy' Cleveland October 17, 2017 | 1:35 PM

One play, five options: How the versatile Celtics might run their new offense October 17, 2017 | 1:12 PM

The Celtics in Newport, Rhode Island

How the Celtics spent their offseason October 17, 2017 | 10:52 AM

J.R. Smith during the trophy presentation after the win over the Boston Celtics during Game Five of the 2017 NBA Eastern Conference Finals at TD Garden on May 25, 2017.

Morning sports update: J.R. Smith said the Celtics don't 'pose a big threat' to Cavs October 17, 2017 | 9:48 AM

LeBron's status for season opener vs. Celtics still unclear October 16, 2017 | 1:52 PM

Marcus Morris speaks to the media after one of his first practices with the Celtics.

Marcus Morris will miss at least a week with knee soreness October 16, 2017 | 6:50 AM

CHARLOTTE, NC - OCTOBER 11: Kyrie Irving #11 of the Boston Celtics watches on against the Charlotte Hornets during their game at Spectrum Center on October 11, 2017 in Charlotte, North Carolina. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Streeter Lecka/Getty Images)

Kyrie Irving on returning to Cleveland: 'There is no blocking out the noise or anything like that' October 16, 2017 | 6:46 AM

Kyrie Irving and Gordon Hayward look on during the first half against the Charlotte Hornets at TD Garden on October 2, 2017.

The inside story of the Celtics' crazy offseason October 16, 2017 | 12:00 AM

Jaylen Brown could be the Celtics' X-factor October 13, 2017 | 4:45 PM

CHARLOTTE, NC - OCTOBER 11: Kyrie Irving #11 of the Boston Celtics reacts against the Charlotte Hornets during their game at Spectrum Center on October 11, 2017 in Charlotte, North Carolina. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Streeter Lecka/Getty Images)

Kyrie Irving on season opener against the Cavs: 'It’s just basketball to me' October 13, 2017 | 2:25 PM

FILE - In this June 17, 2008, file photo, Boston Celtics, from left, Kevin Garnett, left, Ray Allen, and Paul Pierce celebrate in the locker room after winning the NBA basketball championship with a 131-92 win over the Los Angeles Lakers, in Boston. Paul Pierce is retiring as a member of the Boston Celtics. The Celtics announced Monday, July 17, 2017, that they have signed Pierce to a contract so the 10-time All-Star can retire with the team where he spent his first 15 seasons in the NBA. (AP Photo/Winslow Townson, File)

Paul Pierce doesn't think the Celtics or the Cavaliers will win the NBA championship October 13, 2017 | 1:11 PM

Boston, MA - 06/05/08 - Boston Celtics forward Paul Pierce (34) leaves the court to a round of high 5's after the Celtics took Game 1 98-88. - (Globe Staff Photo / Barry Chin) section: Sports, reporter: Marc Spears, slug: 06celtics.

ESPN gave Paul Pierce a hilarious cake for his 40th birthday October 13, 2017 | 10:59 AM

Boston Celtics' Kyrie Irving (11) drives between Charlotte Hornets' Dwight Howard (12) and Frank Kaminsky (44) in the second half of a preseason NBA basketball game in Charlotte, N.C., Wednesday, Oct. 11, 2017. (AP Photo/Chuck Burton)

In a watered-down East, Celtics-Cavs is the best thing going October 12, 2017 | 5:43 PM

Boston Celtics President of Basketball Operations Danny Ainge in 2016.

Danny Ainge 'understands' why Isaiah Thomas might not speak to him again October 12, 2017 | 8:58 AM

Boston Celtics' Kyrie Irving, guards Charlotte Hornets' Kemba Walker in the first half of a preseason NBA basketball game in Charlotte, N.C., Wednesday, Oct. 11, 2017. (AP Photo/Chuck Burton)

Kyrie Irving says there's a 'vast difference' between Boston and Cleveland October 12, 2017 | 6:43 AM