Rafael Nadal attacks the US Open, which started on Monday, as world number one for the second week running.
The Spaniard took over the ATP rankings summit last week for the first time since July 2014.
The 31-year-old, aiming for his second Grand Slam of the season in New York after his success in the French Open, tops the latest ATP charts released Monday with 7 645 points.
The top 10 were unchanged with Andy Murray, who pulled out of the US Open on Sunday with a hip injury, in second and Roger Federer third.
Latest ATP Tour rankings
Rafael Nadal (ESP) 7.645
Andy Murray (GBR) 7.150
Roger Federer (SUI) 7.145
Stan Wawrinka (SUI) 5.690
Novak Djokovic (SRB) 5.325
Alexander Zverev (GER) 4.470
Marin Cilic (CRO) 4.155
Dominic Thiem (AUT) 4.030
Grigor Dimitrov (BUL) 3.710
Kei Nishikori (JPN) 3.195.