"I took all the energy from the fans. That's what I did in the end, just kept fighting. I didn't give up.I was ready to win the match from that moment."
Del Potro, whose career has been repeatedly interrupted by wrist surgeries and rehab, now finds himself facing Federer yet again in New York, with the Swiss leading their series 15-5 while winning the last three matches - including Miami in March.
"Of course, I admire him, everybody loves him. Is going to be interesting match for play, after eight years again in the central court," Del Potro said. "I know how to play if I want to win, but I will see how physically I feel after this battle. But always it's a pleasure to play the greatest guy on the history."