The hindrance rule that chair umpire Eva Asderaki used to dock Serena Williams a point Sunday in her U.S. Open final loss to Sam Stosur:
26. HINDRANCE
If a player is hindered in playing the point by a deliberate act of the opponent(s), the player shall win the point.
However, the point shall be replayed if a player is hindered in playing the point by either an unintentional act of the opponent(s), or something outside the player’s own control (not including a permanent fixture).
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