Anthony Davis scored 28 points and LeBron James posted 22 while becoming the second-leading Christmas Day scorer in NBA history during the Los Angeles Lakers' 138-115 victory over Dallas Mavericks.
Montrezl Harrell scored 17 of his 22 points in the second half, and Dennis Schroder had 18 points as the champions closed out their first win of the season with a dominant fourth quarter.
"The more we play with each other, the more we're going to figure things out," Davis said.
"We prided ourselves on not losing two in a row last year, so we wanted to come out and make sure we do that."
Luka Doncic had 27 points and seven assists as the Mavs started 0-2 with a late fade at Staples Centre.
James moved into second place behind Kobe Bryant for the most points scored on December 25, passing Oscar Robertson in the third quarter. James has 383 points in 15 games on Christmas Day, while Bryant had 395 in 16 holiday appearances.
LA rivals the Clippers saw off Denver Nuggets 121-108 in Colorado thanks largely to Paul George's 23 points and nine rebounds.
Kawhi Leonard scored 21 before leaving in the fourth quarter bleeding profusely from the mouth after colliding with teammate Serge Ibaka's elbow.
"He got up and walked off the floor, so he's going to be good," Clippers coach Tyronn Lue said.
Ibaka had 15 points for the Clippers who exacted a bit of revenge after blowing a 3-1 series lead against the Nuggets in last season's Western Conference semi-finals and falling in seven games.
Denver's Nikola Jokic finished with 24 points, 10 assists and nine rebounds and Jamal Murray had 13 of his 23 points in the final quarter.
Miami Heat overcame an ankle injury to star Jimmy Butler and an inspired performance from Zion Williamson to defeat the visiting New Orleans Pelicans 111-98.
Williamson, making his Christmas Day debut, produced his second double-double in two games this season with 32 points and 14 rebounds, both game highs, as Brandon Ingram added 28 points.
Miami (1-1) were led by Duncan Robinson, who had 23 points including seven three-pointers - tying the Christmas Day single-game mark set by Ingram last year.
Milwaukee Bucks also recorded their first win of the season comprehensively beating Golden State Warriors 138-99.
Khris Middleton led the way with 31 points, while back-to-back league MVP Giannis Antetokounmpo scored 15 points and claimed 13 rebounds.
Steph Curry had 19 points for Golden State, which moved him up to second in the franchise's all-time scoring list.
Kyrie Irving scored 37 points while Kevin Durant added 29 as the visiting Brooklyn Nets enjoyed a successful return to the NBA's Christmas Day schedule with a 123-95 win over the Celtics.
In his first regular-season game in Boston since joining the Nets, Irving made 13 of 21 shots, hit seven three-pointers and handed out eight assists.
Jaylen Brown scored 27 points for the Celtics (1-1) while Jayson Tatum added 20 and eight rebounds.