Rafael Nadal and Fernando Gonzalez have waited through a steady rain in hopes of finishing their suspended US Open quarter-final match while the women's semi-finals were postponed.
After waiting through nearly five hours of downpours, tournament officials moved matches involving defending champion Serena Williams and Belgium's Kim Clijsters plus Denmark's Caroline Wozniacki and Belgium's Yanina Wickmayer.
Six-time Grand Slam champion Nadal and Chilean 11th seed Gonzalez were set to return to Arthue Ashe Stadium should the drenching relent as organizers clung to hopes of finishing as scheduled.
Nadal was aided by the break, having aggravated an abdominal muscle strain while seizing a 7-6 (7-4) 6-6 (3-2) advantage before play was halted.
The men's doubles final and a women's doubles semi-final were also awaiting their scheduling fate after postponements.
While breaks in the drizzle had allowed for some attempts to dry the courts, conditions were far from playable.
Five-time defending champion Roger Federer, the Swiss 15-time Slam champion, and Serbian fourth seed Novak Djokovic are set for one men's semi-final while Argentine sixth seed Juan Martin Del Potro awaits the Nadal-Gonzalez winner.