(New York, NY) — The U.S. Open starts Monday in New York City. More than 700-thousand tennis fans are expected to attend the two-week tournament at the Billie Jean King National Tennis Center in Flushing Meadows. American Sloane Stephens will be defending her women’s singles champion title. Serena Williams will be pursuing a record-tying 24th Grand Slam title and may have to face top-ranked Romanian player Simona Halep. Her sister, Venus Williams, is seeded 16th. In the men’s tournament, last year’s champion, Rafael Nadal, will start against fellow Spaniard David Ferrer. Roger Federer will play Wimbledon winner Novak Djokovic.