That will happen this week in Vienna for one of the few times in their career, as Mike Bryan will team with Steve Johnson while Bob Bryan takes a break for the birth of his third child.
Mike has occasionally had other partners. He won titles with Mahesh Bhupathi and Mark Knowles in 2002, and partnered with Mardy Fish against Spain in the 2008 Davis Cup semifinal, when Bob had a shoulder injury. Mike also partnered with Fish in the first round in 2012 against Switzerland, when Bob had his first child.
Johnson was one half of the pairing that defeated the Bryans in the first round of the U.S. Open.
Mike and Johnson will be unseeded and will play the second seeds in the first round.
Bob and Mike Bryan played Shanghai a week ago, falling in the second round.