Gulbis won the Delray Beach International Tennis Championships in Florida and improved to 3-0 in tournament finals. That moves him up 42 spots to No. 67 in the rankings.
Djokovic ran his current winning streak to 18 matches in winning the ATP tournament in Dubai and Nadal is 12-of-13 in matches since returning from a knee injury after he won the tournament in Acapulco.
It was the 52nd title for Nadal while Djokovic has 36. They are second and third on the list of championships among active players behind Roger Federer, who has won 76 tournaments.
Djokovic increased his lead at No. 1. He has been atop the rankings for 71 weeks and next Monday will tie Stefan Edberg for 10th most weeks at No. 1. He has 13,280 rankings points, handily ahead of the second-ranked Federer's 9,535.
Tomas Berdych (4,740 points) is sixth, with Juan Martin del Potro i(4,410) in seventh, followed by Jo-Wilfried Tsonga at 3,660. Janko Tipsarevic is ninth with 3,125 points and Richard Gasquet (2,880) completes the Top 10.
The ATP heads to Indian Wells, Calif., this week for the BNP Paribas Open, a World Tour Masters 1000 event. Federer is the defending champion.