Britain's Andy Murray poses with the trophy after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament in New York. (Mike Groll/AP)

Britain's Andy Murray poses with the trophy. (Mike Groll/AP)

Britain's Andy Murray poses with Serbia's Novak Djokovic after the championship match at the 2012 US Open tennis tournament in New York. His considerable lead, and a chance at history, slipping away, Murray dug deep for stamina and mental strength, outlasting Djokovic in a thrilling five-set U.S. Open final. (Mike Groll/AP)

Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament in New York. (Charles Krupa/AP)

It had been 76 years since a British man won a Grand Slam singles championship and, at least for Murray, it was well worth the wait. (AP)

Kim Sears, Andy Murray's girlfriend, applauds after Murray wins a point against Serbia's Novak Djokovic during the championship match at the 2012 US Open tennis tournament in New York. (Darron Cummings/AP)

Andy Murray already had showed he could perform on a big stage by winning the gold medal in front of a home crowd at the London Olympics last month. (AP)

Serbia's Novak Djokovic reacts after falling while playing Britain's Andy Murray during the championship match. (Darron Cummings/AP)

Britain's Andy Murray returns a shot to Serbia's Novak Djokovic during the championship match. (Julio Cortez/AP)

Serbia's Novak Djokovic reacts while playing Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament in New York. (Mike Groll/AP)

A trainer works on Serbia's Novak Djokovic during his match against Britain's Andy Murray during the championship match at the 2012 US Open tennis tournament in New York. Djokovic lost the match. (Charles Krupa/AP)

Murray vs. Djokovic was a test of will as much as skill, lasting 4 hours, 54 minutes, tying the record for longest U.S. Open final. (AP)