NEW YORK -- The revamped US Open mixed doubles tournament -- which drew plenty of criticism for everything from its format (shorter matches) to its field (only 16 teams) -- got underway Tuesday and is already down to its final four, with the trophy and $1 million prize at stake Wednesday night.

Casper Ruud and Iga Swiatek , the No. 3 seeds, easily won their two matches and will face the top-seeded duo of Jessica Pegula and Jack Draper in one semifinal Wednesday. Defending champions Sara Errani and Andrea Vavassori , the only traditional mixed doubles team in the fast-pace event, meet Danielle Collins and Christian Harrison -- who weren't even the draw until Jannik Sinner and Katerina Siniakova withdrew Tuesday morning because of Sinner's illness -- in the other.

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