In the men's draw, Roger Federer was left waiting until almost midnight to start his US Open fourth round match but made up for the delay with a brutal 6-1, 6-2, 6-0 dismantling of Argentine Juan Monaco to reach the quarter-finals.
The Spaniard and defending champion, Nadal, had a tougher than expected match against Andrey Golubev of Kazakhstan but eventually came through in straight sets 6-3, 7-6, 7-5.
With Hurricane Irene lashing the Eastern seaboard of the United States, practice sessions for the final grand slam of the tennis season, the US Open, have been suspended.
The men's clay court season is in full swing at Monte Carlo. Number one seed Rafael Nadal had to come back against Andy Murray in one semi-final of the Monte Carlo Masters on Saturday. David Ferrer and Jurgen Melzer met in the other one.