Bob and Mike Bryan, the winners of a record five Western & Southern Open titles, headline the initial ATP World Tour doubles entrants for the 2015 tournament.
The field includes eight of the Top 10 teams in the Emirates ATP Doubles Race to London, originally current Grand Slam singles title holders Novak Djokovic and Marin Cilic were slated to compete, but have since withdrawn.
The Bryans are the most successful doubles team in history, owning 107 career titles together and have finished as the No. 1 team on Tour 10 times.
The twin brothers from California have won the last two titles in Cincinnati, and their five titles have come in a record eight finals.
Canada’s Daniel Nestor will be making his 21st appearance in the doubles field, a record for either singles or doubles at the tournament. His first match will be his 56th at the tournament, which will tie him for the overall tournament record (Stefan Edberg played 56 singles matches).
The four-time Cincinnati champion is playing in 2015 with France’s Edouard Roger-Vasselin, the seventh different partner he has had at the event.