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The Golden State Warriors' success is approaching historic levels.

The Warriors beat the Denver Nuggets on Sunday to improve to 15-0, matching the 1993-94 Houston Rockets for the best start to a season in NBA history. They're also the first defending champion in league history to start 15-0.

Golden State isn't the only Western Conference team that's hot, though, as two teams from Texas are starting to separate themselves from the pack.

Check out where all 30 teams stand in our Week 4 Power Rankings, which are updated through Sunday, Nov. 22.

1. Golden State Warriors (15-0): All that stands between the Warriors and an NBA-record 16-0 start is a matchup with the Lakers on Tuesday. We'll offer our congratulations now. Last week: 1

2. Cleveland Cavaliers (10-3): The Cavs have a 1 1/2-game lead over everyone in the Eastern Conference, and Kyrie Irving hasn't even played a game yet. Last week: 2

3. San Antonio Spurs (10-3): LaMarcus Aldridge's sprained ankle in a loss to the Pelicans added injury to insult, but the Spurs beat the red-hot Grizzlies without him Sunday. Last week: 3

4. Chicago Bulls (8-4): The Bulls won every game they played this week (at this point, losing to the Warriors doesn't count) to keep pace with Cleveland in the Central Division. Last week: 7

5. Dallas Mavericks (9-5): Who needs DeAndre Jordan, anyway? Dallas has won six of its last seven to move into third place in the West. Last week: 10

6. Miami Heat (8-4): The schedule-makers were kind to the Heat this week, with Miami falling to Minnesota but notching wins over the Kings and 76ers. Last week: 9

7. Oklahoma City Thunder (8-6): Stop us if you heard this before: Russell Westbrook is trying to do it all and getting mixed results with Kevin Durant on the sideline. Last week: 4

8. Indiana Pacers (8-5): The Pacers scored a combined 235 points in their last two games and have won five of their last six to make things interesting in the Central. Last week: 11

9. Atlanta Hawks (9-6): Atlanta's only two wins over the last two weeks have come against the Pelicans and Kings. But they're still fifth in the East. Last week: 5

10. Toronto Raptors (9-6): The Raptors took care of business at Staples Center with back-to-back wins over the Lakers and Clippers. Last week: 8

11. Washington Wizards (6-4): The Wizards have tightened up defensively, holding their opponents to under 100 points in three consecutive wins. Last week: 16

12. Phoenix Suns (7-6): Phoenix has just two home games in its next nine contests, and one is against the Warriors. That's a tough stretch if we've ever seen one. Last week: 13

13. Boston Celtics (7-6): We wanted to put the Celtics higher on this list, but then they had to go and lose to the Nets by 10. Last week: 12

14: Detroit Pistons (7-6): Detroit earned a promising win over Cleveland on Tuesday but still has lost five of its last seven. Last week: 14

15. Memphis Grizzlies (7-7): Memphis still is allowing more than 100 points per game, but the offense picked up the slack over a recent four-game winning streak. Last week: 19

16. New York Knicks (8-6): Proof that Kristaps Porzingis has been a miracle worker: If the season ended Sunday, the Knicks would be in the playoffs. Last week: 25

17. Utah Jazz (6-6): Strong defensive efforts and subpar offensive outputs have continued to produce mixed results for Utah. Last week: 15

18. Charlotte Hornets (7-6): Six players are averaging double figures in the Hornets' pleasantly surprising offense. Last week: 21

19. Los Angeles Clippers (6-7): The Clippers reportedly had a locker room argument after Sunday's loss, their fifth in six games. Something needs to change, and fast. Last week: 6

20. Orlando Magic (6-7): Evan Fournier and his questionable haircut are off to a great start offensively, averaging 19.2 points per game. Last week: 24

21. Denver Nuggets (6-8): Denver has lost four of five and was the latest victim of the Warriors steamroller Sunday. Last week: 20

22. Portland Trail Blazers (6-9): The Blazers finally snapped a brutal seven-game skid by beating both L.A. teams, which apparently is the thing to do these days. Last week: 22

23. Milwaukee Bucks (5-8): The Bucks haven't won since they toppled the Cavs in overtime last Saturday. Last week: 17

24. Houston Rockets (5-9): The Rockets managed to win a game after Kevin McHale's surprise firing but promptly dropped the next two. Last week: 18

25. Minnesota Timberwolves (5-8): Karl-Anthony Towns might give Jahlil Okafor a run for his money in this season's Rookie of the Year voting. Last week: 23

26. Sacramento Kings (5-9): The Kings are 5-4 when DeMarcus Cousins is on the court and 0-5 when he sits. Last week: 26

27. New Orleans Pelicans (3-11): New Orleans has a long way to go to erase its horrible start, but back-to-back wins over San Antonio and Phoenix is a good start. Last week: 28

28. Brooklyn Nets (3-11): The Celtics suffered a double loss by allowing the owner of their 2016 first-round pick to come away with a victory Sunday. Last week: 29

29. Los Angeles Lakers (2-11): L.A. is back to full-on tank mode after beating the Pistons a week ago. Last week: 27

30. Philadelphia 76ers (0-14): What will happen first: A Warriors loss or a Sixers win? Last week: 30

Thumbnail photo via Kevin Jairaj/USA TODAY Sports Images