The Washington Kastles — defending World Tennis Team champions , mind you — announced a big move today: both Williams sisters, Serena and Venus, will play for D.C.’s WTT outfit this summer. “The historic opportunity to have both Serena and Venus on our team is a thrill, both for the success of our team and for our fans, whose support has been so integral to our success,” said team owner Mark Ein. World number one Serena, who has been a Kastles mainstay since 2008, will be joined by fifth-ranked Venus, who will call Kastles Stadium home after

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Both Williams Sisters to Play for Kastles This Summer