Williams sisters on collision course at U.S. Open

By Simon Cambers NEW YORK (Reuters) - Serena and Venus Williams, the sisters with 29 grand slams and a stack of records between them, will try to maintain a collision course at the U.S. Open on Monday when they play their fourth-round matches. World number one and defending champion Serena, trying to break the record of 22 grand slam titles she shares with Steffi Graf, plays number 52 Yaroslava Shvedova of Kazakhstan. Top seed Serena is still managing the right shoulder injury she suffered at th