Serena Williams flirted with grand slam danger once again but kept her calendar-year Grand Slam bid on track by beating a battling 101st-ranked Bethanie Mattek-Sands 3-6 7-5 6-0 at the U.S. Open on Friday.

Rafael Nadal dropped out of the top five in the ATP rankings for the first time in 10 years last Monday after failing to defend his title at the Madrid Masters.

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