Jayson Tatum scored 29 points and the Boston Celtics ran past Memphis 122-107 on Tuesday, putting the Grizzlies in further danger of missing the playoffs.

The Grizzlies missed another chance to guarantee themselves a spot in the Western Conference play-in series, and could fall out of eighth place if Portland beats Dallas later Tuesday.

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Gordon Hayward of the Boston Celtics handles the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Jayson Tatum scored 29 points and the Boston Celtics ran past Memphis 122-107 on Tuesday, putting the Grizzlies in further danger of missing the playoffs.

Brandon Clarke of the Memphis Grizzlies slam dunks the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Gordon Hayward added 19 points and five assists.

Boston Celtics' Kemba Walker handles the ball during the second half of an NBA basketball game against the Memphis Grizzlies Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Memphis will head into its final seeding game against Milwaukee on Thursday needing a win to earn a place in the play-in game. The team that finishes ninth would have to beat the eighth-place team twice.

Memphis Grizzlies' Brandon Clarke (15) handles the ball as Boston Celtics' Gordon Hayward (20) defends during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Tied at 13 in the first quarter, the Celtics went a 33-11 run and led by as many as 22 in the second quarter.

Boston Celtics' Gordon Hayward dribbles the ball as Memphis Grizzlies' Ja Morant defends during the third quarterof an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Celtics: Closed first quarter on 11-4 run. Shot 51% from the field (44 of 86) for the game.

Boston Celtics' Gordon Hayward defends against Memphis Grizzlies' De'Anthony Melton (0) during the third quarter of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

More AP NBA: https://apnews.com/NBA and https://twitter.com/AP_Sports

Boston (48-23), which has already locked up the Eastern Conference’s third seed, won its fourth straight.

Gordon Hayward of the Boston Celtics handles the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Gordon Hayward of the Boston Celtics handles the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Gordon Hayward added 19 points and five assists.

Memphis (33-39) lost for the sixth time in seven games since the restart. Ja Morant finished with 26 points and 13 assists.

The Grizzlies arrived in Florida with 3 1/2-game cushion over their nearest competitor for the eighth seed in the West. But their struggles have guaranteed the need for a play-in game for that final spot with Portland, San Antonio and Phoenix all still in contention.

Brandon Clarke of the Memphis Grizzlies slam dunks the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Brandon Clarke of the Memphis Grizzlies slam dunks the ball during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Memphis will head into its final seeding game against Milwaukee on Thursday needing a win to earn a place in the play-in game. The team that finishes ninth would have to beat the eighth-place team twice.

Boston didn’t look like a team coasting into the postseason. Celtics coach Brad Stevens played his regular starters and they were active on both ends of the floor

Tatum paced the offensive attack, scoring 17 points in just 15 minutes of action in the first half.

Boston Celtics' Kemba Walker handles the ball during the second half of an NBA basketball game against the Memphis Grizzlies Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Boston Celtics' Kemba Walker handles the ball during the second half of an NBA basketball game against the Memphis Grizzlies Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Tied at 13 in the first quarter, the Celtics went a 33-11 run and led by as many as 22 in the second quarter.

Boston held the Grizzlies to 33% (17 of 51) shooting in the half, including 1 of 13 (7.7%) from the 3-point line.

TIP-INS

Memphis Grizzlies' Brandon Clarke (15) handles the ball as Boston Celtics' Gordon Hayward (20) defends during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Memphis Grizzlies' Brandon Clarke (15) handles the ball as Boston Celtics' Gordon Hayward (20) defends during the second half of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (AP PhotoMike Ehrmann, Pool)

Celtics: Closed first quarter on 11-4 run. Shot 51% from the field (44 of 86) for the game.

Grizzlies: Finished 24% (7 of 29) from beyond the arc.

UP NEXT

Celtics: Play Wizards on Thursday.

Grizzlies: Play Bucks on Thursday

Boston Celtics' Gordon Hayward dribbles the ball as Memphis Grizzlies' Ja Morant defends during the third quarterof an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Boston Celtics' Gordon Hayward dribbles the ball as Memphis Grizzlies' Ja Morant defends during the third quarterof an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

More AP NBA: https://apnews.com/NBA and https://twitter.com/AP_Sports

Boston Celtics' Gordon Hayward defends against Memphis Grizzlies' De'Anthony Melton (0) during the third quarter of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)

Boston Celtics' Gordon Hayward defends against Memphis Grizzlies' De'Anthony Melton (0) during the third quarter of an NBA basketball game Tuesday, Aug. 11, 2020, in Lake Buena Vista, Fla. (Mike EhrmannPool Photo via AP)