U.S. Open Day 11: Aces and faults

Radek Stepanek of Czech Republic and Leander Paes of India celebrate match point during their men's doubles semi-final match against Bob Bryan and Mike Bryan of the United States of America on Day Eleven of the 2013 US Open at USTA Billie Jean King National Tennis Center. (Sept. 5, 2013) Credit: Getty Images
The tennis players' sign language: A nod is calling for a ball from the ballpersons. A hand wiping in front of the face is calling for a towel. A raised finger, or raised racket, toward the chair umpire is calling for a challenge review.
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