It was the Spaniard's second title triumph in two weeks on the back of Monte Carlo as he prepares for a tilt at an unprecedented 10th French Open title.
He started last week in fifth place, 1,415 points behind reigning French Open champion Wawrinka and he ended it just 545 points adrift.
The only positional change in the top 10 saw Tomas Berdych move ahead of David Ferrer into eignth place with Novak Djokovic still in top spot by a huge margin over Andy Murray.
ATP top 20:
1. Novak Djokovic (SRB) 15,550 pts
2. Andy Murray (GBR) 8,175
3. Roger Federer (SUI) 7,785
4. Stan Wawrinka (SUI) 6,640
5. Rafael Nadal (ESP) 5,915
6. Kei Nishikori (JPN) 4,290
7. Jo-Wilfried Tsonga (FRA) 3,400
8. Tomas Berdych (CZE) 3,120 (+1)
9. David Ferrer (ESP) 3,010 (-1)
10. Richard Gasquet (FRA) 2,840
11. Milos Raonic (CAN) 2,740
12. Marin Cilic (CRO) 2,680
13. David Goffin (BEL) 2,605
14. Gaël Monfils (FRA) 2,460
15. Dominic Thiem (AUT) 2,420
16. John Isner (USA) 2,235
17. Roberto Bautista Agut (ESP) 2,015
18. Gilles Simon (FRA) 1,900
19. Kevin Anderson (RSA) 1,840
20. Nick Kyrgios (AUS) 1,765