Stephen Curry continues to lead the NBA in PER even though he continues to regress toward his newfound mean ahead of Russell Westbrook, Kevin Durant and now Kawhi Leonard in fourth with LeBron James rounding out the top-5.

Paul George, meanwhile, has dropped from 12th to 24th in PER in just one week. George had a 23.7 PER seven days ago and 21.5 this week. George has a PER of just 9.7 in his past five games and 16.4 in December.

PER Rankings (Week 9)
1. Stephen Curry: 32.1
2. Russell Westbrook: 30.3
3. Kevin Durant: 29.3
4. Kawhi Leonard: 27.3
5. LeBron James: 25.7
6. James Harden: 24.9
7. Anthony Davis: 24.6
8. Enes Kanter: 24.2
9. Hassan Whiteside: 23.9
10. Andre Drummond: 23.7
11. Derrick Favors: 23.7
12. Blake Griffin: 23.7
13. Chris Paul: 23.7
14. Kyle Lowry: 23.0
15. Paul Millsap: 22.8
16. Nikola Vucevic: 22.7
17. Karl-Anthony Towns: 22.2
18. Greg Monroe: 22.1
19. Pau Gasol: 22.0
20. DeMarcus Cousins: 21.8
21. Nikola Jokic: 21.8
22. Reggie Jackson: 21.8
23. Chris Bosh: 21.8
24. Paul George: 21.5
25. Isaiah Thomas: 21.5

The Boston Celtics moved up into the top-5 in Efficiency Differential this week, improving by one full point.

The San Antonio Spurs (14.0 to 14.0) and Golden State Warriors (13.3 to 13.2) remain virtually unchanged from last week. The Cleveland Cavaliers dropped from 6.6 points per 100 possessions to 4.9.

At the bottom, the Philadelphia 76ers had an increase from -13.6 to -13.0 with their win over the Phoenix Suns.

Week 9 Rankings

1. San Antonio: 14.0
2. Golden State: 13.2
3. Oklahoma City: 8.5
4. Cleveland: 4.9
5. Boston: 4.5
6. Indiana: 4.1
7. Toronto: 4.0
8. Charlotte: 2.9
9. Miami: 2.3
10. Orlando: 2.1
11. Atlanta: 2.1
12. L.A. Clippers: 1.7
13. Detroit: 1.2
14. Chicago: 0.9
15. Dallas: 0.4
16. Utah: -0.4
17. Portland: -1.0
18. Houston: -1.3
19. Phoenix: -1.7
20. New York: -2.0
21. Washington: -2.5
22. Sacramento: -2.6
23. Minnesota: -2.6
24. Memphis: -3.5
25. New Orleans: -4.7
26. Denver: -5.0
27. Milwaukee: -6.3
28. Brooklyn: -6.9
29. L.A. Lakers: -11.5
30. Philadelphia: -13.0

Stephen Curry continues to lead the NBA in PER and has seemingly settled in around 33.0. Curry has a PER of 31.0 for the month of December.

Karl-Anthony Towns elevated his PER from 21.7 (23rd overall) to 22.5 (16th overall) over the past week.

PER Rankings (Week 8)
1. Stephen Curry: 33.0
2. Russell Westbrook: 30.2
3. Kevin Durant: 29.3
4. LeBron James: 27.2
5. Kawhi Leonard: 27.0
6. Blake Griffin: 24.9
7. James Harden: 24.8
8. Hassan Whiteside: 24.6
9. Anthony Davis: 24.5
10. Derrick Favors: 24.2
11. Andre Drummond: 23.9
12. Paul George: 23.7
13. Kyle Lowry: 23.4
14. Enes Kanter: 23.2
15. Paul Millsap: 22.9
16. Karl-Anthony Towns: 22.5
17. Chris Paul: 22.4
18. Reggie Jackson: 22.4
19. Isaiah Thomas: 22.3
20. Greg Monroe: 22.2
21. Eric Bledsoe: 22.0
22. DeMarcus Cousins: 21.9
23. Nikola Vucevic: 21.8
24. Pau Gasol: 21.6
25. Clint Capela: 21.5

The San Antonio Spurs overtook the Golden State Warriors for the top slot in Efficiency Differential last week. The Spurs are scoring 14.0 points per 100 possessions more than their opponents compared to 13.3 for the Warriors.

The Spurs are 23-5 compared to the Warriors' 26-1 record.

Full Week 8 Rankings

1. San Antonio: 14.0
2. Golden State: 13.3
3. Oklahoma City: 8.3
4. Cleveland: 6.6
5. Indiana: 4.6
6. Charlotte: 3.8
7. Boston: 3.5
8. Toronto: 3.3
9. Orlando: 2.2
10. Miami: 2.0
11. Detroit: 1.8
12. L.A. Clippers: 1.4
13. Atlanta: 1.1
14. Chicago: 1.0
15. Dallas: 0.3
16. Utah: -0.4
17. New York: -0.6
18. Phoenix: -0.7
19. Minnesota: -0.9
20. Portland: -1.0
21. Houston: -1.7
22. Sacramento: -2.3
23. Washington: -4.3
24. Memphis: -4.5
25. Denver: -4.9
26. New Orleans: -6.1
27. Milwaukee: -6.4
28. Brooklyn: -7.2
29. L.A. Lakers: -11.0
30. Philadelphia: -13.6

The PER of Stephen Curry has dropped from 34.9 last week to 33.6 this week as the Golden State Warriors concluded their seven-game road trip.

LeBron James jumped from sixth to fourth this week, while Russell Westbrook and Kevin Durant remained second and third.

PER Rankings (Week 6)
1. Stephen Curry: 33.6
2. Russell Westbrook: 31.0
3. Kevin Durant: 29.9
4. LeBron James: 27.2
5. Kawhi Leonard: 26.7
6. Blake Griffin: 25.3
7. James Harden: 25.3
8. Paul George: 24.9
9. Derrick Favors: 24.8
10. Kyle Lowry: 24.6
11. Hassan Whiteside: 24.5
12. Anthony Davis: 24.1
13. Andre Drummond: 24.0
14. Paul Millsap: 23.4
15. Enes Kanter: 22.9
16. Greg Monroe: 22.6
17. Eric Bledsoe: 22.5
18. DeMarcus Cousins: 22.3
19. John Wall: 21.9
20. Dirk Nowitzki: 21.8
21. Isaiah Thomas: 21.8
22. Chris Paul: 21.7
23. Karl-Anthony Towns: 21.7
24. Reggie Jackson: 21.6
25. Chris Bosh: 21.5

The San Antonio Spurs have tied the Golden State Warriors for the top slot in Efficiency Differential at +13.0 points per 100 possessions.

The Cleveland Cavaliers reentered the top-5, jumping from seventh to fourth. 

Full Week 7 Rankings

1. Golden State: 13.0
2. San Antonio: 13.0
3. Oklahoma City: 7.1
4. Cleveland: 5.7
5. Boston: 4.9
6. Charlotte: 4.9
7. Toronto: 4.8
8. Indiana: 3.7
9. Detroit: 1.9
10. Miami: 1.8
11. L.A. Clippers: 1.7
12. Utah: 1.4
13. Orlando: 0.7
14. Dallas: 0.6
15. Chicago: 0.6
16. Atlanta: 0.4
17. Phoenix: 0.2
18. Portland: -0.1
19. Minnesota: -1.2
20. New York: -2.0
21. Houston: -2.6
22. Sacramento: -3.3
23. Washington: -3.6
24. Memphis: -5.5
25. Denver: -5.9
26. Milwaukee: -6.0
27. Brooklyn: -6.1
28. New Orleans: -6.9
29. L.A. Lakers: -10.5
30. Philadelphia: -12.9

Stephen Curry remains the NBA leader in PER, even jumping up from 34.4 last week to 34.9.

Derrick Favors made a big jump this week from 12th to 6th.

PER Rankings (Week 6)

1. Stephen Curry: 34.9
2. Russell Westbrook: 31.0
3. Kevin Durant: 28.5
4. Blake Griffin: 26.6
5. Kawhi Leonard: 26.4
6. Derrick Favors: 26.3
7. LeBron James: 26.2
8. Paul George: 26.0
9. Anthony Davis: 25.8
10. Kyle Lowry: 25.7
11. James Harden: 25.3
12. Hassan Whiteside: 25.1
13. Andre Drummond: 24.5
14. Enes Kanter: 23.6
15. Paul Millsap: 23.3
16. Chris Paul: 23.3
17. Clint Capela: 22.6
18. Reggie Jackson: 22.5
19. DeMarcus Cousins: 22.5
20. Isaiah Thomas: 22.4
21. Greg Monroe: 22.3
22. Dirk Nowitzki: 22.2
23. Eric Bledsoe: 21.7
24. Damian Lillard: 21.6
25. Chris Bosh: 21.4

The Cleveland Cavaliers lost all three of their games last week and have fallen from third to seventh in Efficiency Differential.

The Orlando Magic entered the top-10, jumping from 12th to 10th.

Seven of the top-10 teams are in the Eastern Conference and nine of the top-12.

Full Week 6 Rankings

1. Golden State: 15.0
2. San Antonio: 10.6
3. Oklahoma City: 5.4
4. Indiana: 5.2
5. Boston: 4.8
6. Miami: 4.6
7. Cleveland: 4.1
8. Toronto: 3.7
9. Charlotte: 2.8
10. Orlando: 2.1
11. Atlanta: 2.1
12. Detroit: 1.6
13. Utah: 1.6
14. L.A. Clippers: 1.0
15. Chicago: 0.7
16. Dallas: 0.7
17. Phoenix: 0.2
18. Portland: -0.1
19. Minnesota: -0.7
20. New York: -1.0
21. Memphis: -3.4
22. Sacramento: -4.0
23. Houston: -4.4
24. Washington: -4.7
25. Denver: -6.1
26. New Orleans: -6.9
27. Milwaukee: -6.9
28. Brooklyn: -7.5
29. L.A. Lakers: -9.5
30. Philadelphia: -10.7