NBAWeek 21 NBA power rankings: Celtics move past Cavaliers into top fourFlip through the gallery to see USA TODAY Sports' NBA power rankings for Week 21 (Sunday, March 19 through Sunday, March 26) of the 2016-17 season.Michael Dwyer, AP30. Brooklyn Nets (16-57) -Brett Davis, USA TODAY Sports29. Los Angeles Lakers (21-52) -Sergio Estrada, USA TODAY Sports28. Phoenix Suns (22-52) -Jeremy Brevard, USA TODAY Sports27. New York Knicks (27-46) -2Russell Isabella, USA TODAY Sports26. Orlando Magic (27-46) +1Kim Klement, USA TODAY Sports25. Philadelphia 76ers (27-46) +1Kim Klement, USA TODAY Sports24. Minnesota Timberwolves (28-44) -3Troy Wayrynen, USA TODAY Sports23. Sacramento Kings (28-45) +1Jayne Kamin-Oncea, USA TODAY Sports22. Detroit Pistons (34-39) -4Raj Mehta, USA TODAY Sports21. New Orleans Pelicans (31-42) +2Troy Taormina, USA TODAY Sports20. Dallas Mavericks (31-41) -Kevin Jairaj, USA TODAY Sports19. Charlotte Hornets (33-40) -Jeremy Brevard, USA TODAY Sports18. Chicago Bulls (35-39) +4Caylor Arnold, USA TODAY Sports17. Atlanta Hawks (37-36) -3Brett Davis, USA TODAY Sports16. Denver Nuggets (35-38) -1Trevor Ruszkowski, USA TODAY Sports15. Portland Trail Blazers (35-38) +2Troy Wayrynen, USA TODAY Sports14. Miami Heat (35-38) -2Steve Mitchell, USA TODAY Sports13. Indiana Pacers (37-36) +3Trevor Ruszkowski, USA TODAY Sports12. Milwaukee Bucks (37-36) +1Benny Sieu, USA TODAY Sports11. Memphis Grizzlies (40-33) -Soobum Im, USA TODAY Sports10. Oklahoma City Thunder (41-31) -2Troy Taormina, USA TODAY Sports9. Los Angeles Clippers (44-31) +1Jayne Kamin-Oncea, USA TODAY Sports8. Toronto Raptors (44-29) +1Steve Mitchell, USA TODAY Sports7. Utah Jazz (44-29) -2Brian Spurlock, USA TODAY Sports6. Washington Wizards (45-28) +1Ken Blaze, USA TODAY Sports5. Cleveland Cavaliers (47-25) -1Ken Blaze, USA TODAY Sports4. Boston Celtics (48-26) +2Jayne Kamin-Oncea, USA TODAY Sports3. Houston Rockets (51-22) -Brad Penner, USA TODAY Sports2. San Antonio Spurs (56-16) -Soobum Im, USA TODAY Sports1. Golden State Warriors (59-14) -John Hefti, USA TODAY Sports