Venus Williams (left) from the U.S., celebrates after defeating her sister, Serena in a match during the opening day of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates on Thursday.

Venus Williams (left) from the U.S., celebrates after defeating her sister, Serena in a match during the opening day of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates on Thursday.
Venus Williams (left) from the U.S., celebrates after defeating her sister, Serena in a match during the opening day of the Mubadala World Tennis Championship in Abu Dhabi, United Arab Emirates on Thursday.
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