Tennis: Nishikori stuns Djokovic in US Open semifinals
"Other than that second set, my game today was not even close to what I wanted it to be," Djokovic said. "A lot of unforced errors, a lot of short balls."
Chang, the New Jersey-born son of Taiwanese immigrants, knows a thing or two about groundbreaking victories. At age 17, he became the youngest man to win a Grand Slam title when he upset Ivan Lendl and Stefan Edberg (now Federer's coach) at Roland Garros.
A severely infected right big toe forced Nishikori to miss tuneup events before the U.S. Open, and he feared that his lack of conditioning would make for a short stay at Flushing Meadows. Instead, he keeps sticking around - on the court and in the tournament.
"I guess I love to play long matches," he said with a grin.