Toronto's Daniel Nestor and partner Max Mirnyi of Belarus moved atop the ATP's world men's doubles rankings Monday.

Nestor and Mirnyi supplanted Americans Bob and Mike Bryan from top spot. The Bryans had held the No. 1 ranking for nearly two years.

This isn't the first time Nestor has held down top spot in the world rankings. In 2010, he and then partner Nenad Zimonjic of Serbia spent 10 weeks at No. 1.

Nestor and Mirnyi have claimed two tournament titles this season while reaching two other finals. They've also made it to the semifinal round in three other events, including the Australian Open.