The U.S. Open is making a big bet on the potential of mixed doubles, changing the format in ways that will draw curiosity and controversy.

The U.S. Open is moving its mixed doubles championship to the week before singles play begins, hoping a revamped format and $1 million prize will persuade top singles players to chase a Grand Slam doubles title.

The USTA says the changes will showcase doubles to more people. The discipline's stars fear that they will not get to be part of the show.