2021 US Open Series
In tennis, the 2021 US Open Series was the eighteenth edition of the US Open Series, which comprised a group of hard court tournaments that started on July 12, 2021, in Newport.
Tournament schedule
| Legend |
| Grand Slam Event |
| ATP Masters 1000 and WTA 1000 |
| ATP Tour 500 and WTA 500 |
| ATP Tour 250 and WTA 250 |
| Week | Date | Men's Events | Women's Events |
| 1 | July 12 – July 18 | Newport Hall of Fame Open 2021 Champion:  |