The victory moves Federer onto 14 career grand slam titles, level with American Pete Sampras as the most successful grand slam player in men's tennis history.
Bradley Wiggins won the Tour de France and Andy Murray won the Tennis Grand Slam in New York.
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The 31-year-old Federer has done it all in the world of tennis, winning more grand slam titles than any other male player in history and spending a record number of weeks at the top of the world rankings.
The second Grand Slam event of the tennis calendar begins in Paris on May 23 and Clijsters now faces a race to be fit for the tournament.
Ivanovic, the world number four from Serbia, said she had not encountered any foul play in women's tennis, while two-time Grand Slam winner Maria Sharapova believes the game is in good health.
He's the second man in the history of tennis to do this at a Grand Slam tournament, and the first time was in 1927, when Henri Cochet won his final three matches at Wimbledon after losing the first two sets in each.
The French Open, the second grand slam tournament of the tennis season, begins in Paris on May 24.
The Hawk-Eye system uses strategically-placed cameras to determine the exact flight of a ball and is already used in international cricket and at grand slam tennis tournaments.
The punishments handed down by the International Tennis Federation's Grand Slam committee could result in a U.S. Open suspension if Williams commits another major violation in any Grand Slam event in 2010 or 2011.
Entering this year, Andy Murray was the owner of the most dubious distinction in tennis: he was the greatest player never to win a Grand Slam singles title.
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The biggest blow to its image: In September favorite son Roger Federer fumbled away his chances at a tennis grand slam.
Recently it is Djokovic who has received much of the tennis accolades after winning three straight Grand Slam titles with Nadal on the losing end in all three finals.
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After a year of closed-door meetings with tennis players seeking a greater say in the sport and a larger slice of Grand Slam revenues, the U.S. Open is making big changes.
He was joined by fellow grand slam winners Roger Federer, Novak Djokovic and Rafael Nadal in demanding stricter tests and in March the International Tennis Federation announced it would be introducing a Biological Passport program - a more stringent control against doping.
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The tennis season now moves onto grass ahead of the next grand slam, Wimbledon, which starts in London on June 25.
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