What We're Watching AO Day 12 Streaking Slam champions collide in a blockbuster semifinal as US Open champ Coco Gauff faces AO champion Aryna Sabalenka.\xa0
Medvedev Stays Alive in Five\xa0\xa0 Pushed to a 5th set again, Meddy Bear roars. Daniil Medvedev books his AO semifinal return with a determined finish.