The New York Knicks are still unbeaten in pre-season following their 101-95 win over the Boston Celtics.

Derrick Williams scored 19 points for the Knicks, including a three-pointer with less than three minutes remaining on Friday.

The Knicks have won all four of their NBA pre-season games so far as the Celtics lost for the first time, despite 13 points from Isaiah Thomas.

Kelly Oubre Jr. and Marcin Gortat led the Washington Wizards past the Philadelphia 76ers 127-118.

Oubre and Gortat posted 16 points apiece for the Wizards, who led by 34 points at one stage but conceded 44 in the final quarter after they switched to cruise control.

The Oklahoma City Thunder fell 97-78 to the Memphis Grizzlies.

Both teams were missing starters, with Kevin Durant, Russell Westbrook and Serge Ibaka absent for the Thunder, while the Grizzlies rested Mike Conley, Courtney Lee, Zach Randolph and Marc Gasol along with guards Tony Allen and Beno Udrih.

Elsewhere, the Atlanta Hawks were 91-84 winners over the Dallas Mavericks.

Will Barton and Nikola Jokic combined for 38 points as the Denver Nuggets downed the Phoenix Suns 106-81.