LOS ANGELES (AFP) — Boston forward Jayson Tatum poured in 40 points as the Celtics beat the Orlando Magic 126-120 on Saturday to improve to 3-0 in the fledgling National Basketball Association season while the Philadelphia 76ers fell to 0-3.

The rebuilding San Antonio Spurs stunned the Sixers 114-105 in Philadelphia, where frustrated 76ers coach Doc Rivers said after the game his team was "not ready" to win yet.

In Orlando, Tatum's exploits and a 27-point contribution from guard Derrick White helped the Celtics notch another win in a game that featured 21 lead changes with neither team able to build a double-digit advantage.

Orlando big man Wendell Carter knotted the score at 111-111 with a put-back dunk with 4:23 to play.

Carter then fouled Tatum and Tatum's two free throws ignited a 10-2 scoring run that put Boston up for good.

Terrence Ross led the Magic with 29 points and top draft pick Paolo Banchero added 23, but Orlando fell to 0-3.

That's also where the 76ers found themselves after the inexperienced Spurs — whose championship chances were downplayed by none other than coach Gregg Popovich before the season — drained 16 three-pointers on the way to their second straight win.

Devin Vassell scored 22 points, Keldon Johnson added 21 and Tre Jones chipped in 17 for San Antonio while Doug McDermott made four three-pointers on the way to 14 points.