He also pointed to research that suggests seven in 10 Americans support the shift to a five-day schedule.

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Jim Waterhouse, a professor of biological rhythms at Liverpool John Moores University in Liverpool, England, says he often recommends that people crossing three time zones or less and only staying three days or less might want to consider maintaining the same sleeping and waking schedule from home rather than trying to shift the body clock.

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Brewer told the AP that schedule will remain in place in 2014, but the U.S. Open will shift things in 2015: women's semifinals Thursday, men's semifinals Friday, women's final Saturday, men's final Sunday.

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Tournament director David Brewer told the AP that schedule will remain in place in 2014, but the U.S. Open permanently will shift things in 2015: women's semifinals Thursday, men's semifinals Friday, women's final Saturday, men's final Sunday.

WSJ: U.S. Open Tennis To Boost Prize Purse To $50M By 2017