 | Zendaya | | Tashi Donaldson |
| Mike Faist | | Art Donaldson |
| Josh O'Connor | | Patrick Zweig |
| Darnell Appling | | Umpire (New Rochelle Final) |
| Bryan Doo | | Art's Physiotherapist |
| Shane T Harris | | Art's Security Guard |
| Nada Despotovich | | Tashi's Mother |
| Joan Mcshane | | Line Judge (New Rochelle Final) |
| Chris Fowler | | TV Sports Commentator (Atlanta 2019) |
| Mary Joe Fernandez | | TV Sports Commentator (Atlanta 2019) |
| A.J. Lister | | Lily |
| Connor Aulson | | Leo Du Marier |
| Doria Bramante | | Woman with Headset (Atlanta 2019) |
| Christine Dye | | Motel Front Desk Clerk |
| James Sylva | | Motel Husband |
| Kenneth A. Osherow | | Motel Husband |
| Kevin Collins | | New Rochelle Parking Lot Guard |
| Burgess Byrd | | USTA Official / Line Judge US Open Jr. |
| Jason Tong | | Line Judge (New Rochelle Final) |
| Hudson Rivera | | Y. Kucera (US Open Jr. Player) |
| Noah Eisenberg | | T. Svoboda (US Open Jr. Player) |
| Emma Davis | | A. Mueller (US Open Jr. Player) |
| Naheem Garcia | | Tashi's Father |
| Alex Bancila | | Grosu |
| Jake Jensen | | Finn Larsen |
| Konrad Ryba | | Player (New Rochelle Locker Room) |
| Hailey Gates | | Helen (Patrick's Date) |
| Andrew Rogers | | Art's Teammate (Stanford) |
| Beverly Kristenson Helton | | Umpire (Stanford Match) |
| Brad Gilbert | | Art's Trainer (Ohio 2011) |
| Brad Gilbert | | Art's Trainer (Ohio 2011) |
| Sam Xu | | Art's Fan |
| Caleb Schneider | | Puppeteer |
| Jack Amsler | | Tennis Player |
| Sam Arnold | | Tennis Professional |
| David S. Bookbinder | | Tennis Fan |
| Courtney Brooks | | Waitress |
| Lachlan Boyle | | Waiter |
| Dennis Daniel | | Spectator |
| Tierre Diaz | | Tennis Fan |
| Elaine Victoria Grey | | Posh Spectator |
| Jason Hewitt | | Spectator |
| Jeffrey Ford | | Tennis Spectator |
