Get ready for the U.S. Open before play begins with a guide that tells you everything you need to know about how to watch the year's last Grand Slam tennis tournament, what the betting odds are, what the schedule is, who the defending champions are and more: When is the draw for the U.S. Open and when do matches start? — Other countries are listed here. Who are the betting favorites for the U.S. Open? Aryna Sabalenka and Carlos Alcaraz are listed as the money-line favorites to win the singles championships at the U.S. Open, according to BetMGM Sportsbook.