The new US Open mixed doubles tournament -- featuring shorter matches and a smaller field -- got underway Tuesday, with four teams halfway to a trophy -- and a $1 million prize. Casper Ruud and Iga Swiatek,

The thought of the top men’s and women’s singles players teaming up is one that has often intrigued tennis fans around the world.

The U.S. Open overhauled its mixed doubles tournament in hopes of drawing the top singles players. The defending champions don’t intend to move out of the way so easily.