2003 was a landmark season for the Bryans. They reached their first Grand Slam final at
Roland Garros, where they also won their first Grand Slam title, beating
Paul Haarhuis and
Yevgeny Kafelnikov 7-6³ 6-3 in the final, and did not drop a set all through the tournament. They won five titles for the second successive year (
Barcelona, Roland Garros,
Nottingham, Cincinnati Masters, Tennis Masters Cup). With their win at Roland Garros, the Bryans set the record for most doubles titles by a brothers team, breaking Tim and Tom Gullikson's mark of 10. They reached the finals of three other tournaments, including the US Open, became the first brothers duo to finish number 1 in the ATP race, and closed the season by winning the title at Tennis Masters Cup, Houston. They also made their Davis Cup debut' for the United States in 2003, in the World Group Playoff tie in
Slovak Republic, beating
Karol Beck /
Dominik Hrbaty in straight sets and helping US to a 3-2 victory.
In
2004, they won a career-best seven titles, the victories coming at Adelaide, Memphis, Acapulco, Queen's Club, Los Angeles, Basel and Tennis Masters Cup Houston. They also reached four other finals. They were part of the US Tennis Team at the
Athens Olympics in 2004, where they lost in the quarterfinals to eventual gold medalists
Fernando González and
Nicolás Massú of
Chile. They finished another successful season by winning the Tennis Masters Cup for the second year running.
In the year
2005, the Bryans achieved the remarkable feat of reaching all four Grand Slam finals in the season, and though they lost in the first three (
Australian Open, Roland Garros and Wimbledon), the disappointment was overcome when they won the second Grand Slam of their career at the US Open in front of cheering home fans. They also won tournaments at Scottsdale, Queen's Club and Washington ATP, and made it to the finals at Memphis,
Monte Carlo TMS and
Rome TMS.
The year
2006 also started on a positive note for the twins, winning the first Grand Slam of the season, the
2006 Australian Open, where they beat
Leander Paes of India and Martin Damm of the
Czech Republic 4-6, 6-3, 6-4 in the final. They completed the career slam a few months later at Wimbledon, beating
Fabrice Santoro and
Martin Damm in four sets in the final.