Roger Federer has leapfrogged Andy Murray back into number two in the ATP world rankings after successfully defending his Cincinnati crown.
Swiss star Federer won his seventh Western and Southern Open title via a 7-6 (7-1) 6-3 victory over Novak Djokovic on Sunday.
Back-to-back titles at the Masters tournament ensured Federer moved up one place to second, ahead of Andy Murray, whom he ousted in the semi-finals.
Federer's new ranking is a boost to his US Open hopes, with the 17-time grand slam winner now separated from world number one Djokovic on the opposite side of the main draw.
The rest of the men's top 10 - made up of Kei Nishikori, Stan Wawrinka, Tomas Berdych, David Ferrer, Rafael Nadal, Marin Cilic and Milos Raonic - remains unchanged.
Ukrainian Alexandr Dolgopolov was one of the biggest movers after improving 27 positions to 39th in the world.
Dolgopolov reached the semi-finals at the Western and Southern Open - his second final-four appearance in 2015.
On the WTA Tour, Simona Halep moved up to second in the rankings despite losing 6-3 7-6 (7-5) to world number one Serena Williams in Sunday's Cincinnati final.
Halep's run to the decider was enough to overhaul Maria Sharapova, who withdrew before her tournament got underway due to an ongoing thigh problem.
Caroline Wozniacki and Petra Kvitova exchanged positions, with the former now fourth.
Ana Ivanovic climbed two spots to seventh as Karolina Pliskova and Garbine Muguruza dropped to eighth and ninth respectively.
Carla Suarez Navarro rounds out the 10.