Andy Roddick also defended the late withdrawals of his fellow players at recent Masters events.
He got one when he played Andy Roddick in Arthur Ashe Stadium last year.
The Australian Open champion was joined in the third round by 2003 Toronto champion Andy Roddick.
The next highest-ranked Americans are Andy Roddick at 14 and John Isner at 18.
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Tommy Haas also retired injured from his match to join Andy Roddick in quitting the event.
Tenth seed Andy Roddick retired hurt when leading 6-3 2-3 against Guillermo Garcia-Lopez of Spain.
Cilic will face Andy Roddick after coming through a marathon fourth-round match after four hours and 38 minutes.
Federer will next face Swiss compatriot Stanislas Wawrinka after he disposed of American Andy Roddick in straight sets.
Meanwhile, Andy Roddick has confirmed he will not play for the United States in David Cup this year.
Home favorite Andy Roddick, playing in his final tournament, is looming as a possible quarterfinal opponent for Djokovic.
Sixth seed Andy Roddick then completed a good night for the Americans by beating Sweden's Thomas Enqvist 6-4 6-4.
Later on Sunday, Spain's Fernando Verdasco upset top seed Andy Roddick to win the SAP Open in San Jose.
The group who met the Queen also included Venus Williams, Caroline Wozniacki, Jelena Jankovic, Novak Djokovic and Andy Roddick.
The 22-year-old Scot suffered defeat against Andy Roddick in the last four, but said he would continue to improve.
As long as Nadal and Federer and Serena and Andy Roddick are playing, people will flock to Flushing Meadows.
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But Gilbert came with a CV that included working with former world number ones Andre Agassi and Andy Roddick.
"You have to understand -- people see tennis a lot, " Andy Roddick said.
Tonight will be the first time in my life that I will watch Andy Roddick live on the tennis court.
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The third-seeded Moroccan, who was beaten by Andy Roddick in a dramatic quarter-final in Melbourne, lost his first-round match 7-5 6-3.
Blake will next face France's Jo-Wilfried Tsonga, who beat Andy Roddick 5-7 6-4 7-6 (7-5) in the evening match in Paris.
Model turned actress Brooklyn Decker was there to support her husband Andy Roddick, who lost to David Ferrer in the third round.
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Meanwhile, top seed Andy Roddick will play defending champion Radek Stepanek in Sunday's men's final at the Pat Rafter Arena.
Ljubicic, who reached a career-high third in the world rankings in 2006, will face American seventh seed Andy Roddick in Sunday's final.
If Rusedski can beat Waske, he is likely to face American Andy Roddick in the second round at the All England Club.
Rafael Nadal and Andy Roddick meet in the other semi-final on Friday.
Third seed Andy Roddick , who has yet to lose his serve in two matches, beat 32nd seed Gilles Simon 6-4 6-4.
Andy Roddick will meet compatriot Jan Michael Gambill in the other semi-final.
In the men's event, eighth-seeded Sam Querrey upset top seed and fellow American Andy Roddick 7-5 3-6 6-1 to book reach the semifinals.
The eight players in the Masters Cup field are: Nadal, Gasquet, Federer, Fernando Gonzalez, Novak Djokovic, Nikolay Davydenko, Andy Roddick and David Ferrer.
The grass-based tournament will feature world number three Andy Murray and three former world number ones: Andy Roddick, Lleyton Hewitt and Marat Safin.
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