Yogi Ferrell's 3-pointer after the travel put Dallas up 70-53. Galloway hit two big triples to open the fourth quarter.
Westbrook shot 3/13 in the second half, finishing the game with 27 points on 10/29 shooting - including 1/10 from downtown.
Much of the Thunder's success is based on their good starts, especially when they're able to have measured contributions from Russell Westbrook, Paul George and Carmelo Anthony.
Smith finished with 15 points. Miami was up 25 the same night and hung on to win by one.
It led to an easy night for the Spurs.
In four games during the last two seasons against Dallas (three last season, one this season), Westbrook has averaged 34.5 points, 8.3 rebounds and 5.8 assists.
"That was a very hard trip for the Hornets", Popovich said. Coming back after being in Cleveland, getting back that late and then having to play a seven o'clock game, that's a very hard turnaround.
Hornets coach Steve Clifford agreed.
"The second half, the whole way, we played well defensively". "That's something we're matured in, letting the game tell us what to do and being aggressive". "I played those guys huge minutes. We had very little legs".
Oklahoma City had a 10-point lead at the half and was up 15 midway through the third quarter before the Pistons stormed back, led by centre Andre Drummond and bench players Ish Smith and Langston Galloway.
Thunder on the road - A majority of OKC's problems this year have come on the road, where they are 2-7, and they have lost their past five games away from home. They could never make a serious run at the Spurs. "The games will tell us what to do", said Reggie Jackson, who had 12 points.
"They force a lot of turnovers, leading the league in steals". "In periods of time, we just really haven't gotten going". Because they continue to defy the odds with their impressive start to this season; they are 12-6 and second in the Eastern Conference standings behind Boston. Lance Stephenson had 16 points and eight rebounds, and Damontas Sabonis had 17 points and eight boards.
When is Game Time? He sat with a bruised right knee sustained in Friday's 107-104 win over Toronto. Tolliver scored his eight points in the first half, hitting consecutive triples late in the first quarter. Steven Adams had 12 rebounds, George added 11 and Westbrook had his 10 as Oklahoma City dominated Golden State on the glass 50-39, its second-largest advantage in that category this season. The Thunder bench combined for 12 points on Wednesday against the Warriors, but it was overlooked due to the surprising win. He blazed through the first quarter, putting up 14 points and controlling the tempo of the game.
NY starters Kristaps Porzingis and Enes Kanter sat out the game because of back ailments, and Michael Beasley and Kyle O'Quinn started. The Thunder, though they have under-performed on offense so far this season, have been terrific on defense, allowing just 98.5 points per 100 possessions. The reserves were bad again on Friday against Detroit, contributing 13 total points and providing virtually no backup on a night the starters were bad.