Tennis-U.S. Open order of play on Tuesday

NEW YORK, Sept 7 (Reuters) - Order of play on the main showcourt at the U.S. Open on Tuesday (prefix number denotes seeding): Arthur Ashe Stadium (1600 GMT/12 PM ET) Kristina Mladenovic (France) v Roberta Vinci (Italy) 19-Jo-Wilfried Tsonga (France) v 9-Marin Cilic (Croatia) (2300 GMT/7 PM ET) 1-Serena Williams (U.S.) v 23-Venus Williams (U.S) 1-Novak Djokovic (Serbia) v 18-Feliciano Lopez (Spain) (Reporting by Steve Keating in New York. Editing by Andrew Both)