Tennis players (from left) Jack Sock, Serena Williams, Victoria Azarenka and Andy Murray appear at US Open Arthur Ashe Kids Day at the USTA Billie Jean King National Tennis Center in New York on Saturday.
Tennis players (from left) Jack Sock, Serena Williams, Victoria Azarenka and Andy Murray appear at US Open Arthur Ashe Kids Day at the USTA Billie Jean King National Tennis Center in New York on Saturday.