2021 U.S. Open: What to Watch on Thursday. Tennis, United States Open (Tennis), Television, Content Type: Service, Hurkacz, Hubert (1997- ), Sock, Jack, Bublik, Alexander (1997- ), Anisimova, Amanda (2001- ), Pliskova, Karolina, Kontaveit, Anett (1995- ), Teichmann, Jil (1997- ), Seppi, Andreas, Hsieh Su-wei, Sorribes Tormo, Sara