The US Open men's final was switched from Sunday to Monday for the fifth year in a row after Saturday's second semi-final between Novak Djokovic and David Ferrer was suspended because of bad weather.
Ferrer was leading 5-2 in the opening set when officials stopped the match because of high winds and announced play would not resume until Sunday because of an approaching thunderstorm.
Earlier, Andy Murray won the first semi-final, beating Tomas Berdych 5-7, 6-2, 6-1, 7-6.
Murray overcomes Berdych to enter US Open final
Brilliant Djokovic, Ferrer through to US Open semis
Berdych stuns Federer at US Open
Djokovic prepared for tough battle against Del Potro
PHOTOS: Azarenka, Ferrer advance at rain-hit US Open