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 |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 | 2021 [Hall of Fame Open|Newport] Hall of Fame Open 2021 Champion:  Week 1Hall of Fame OpenWeek 2Truist Atlanta OpenWeek 3Citi OpenMubadala Silicon Valley ClassicWeek 4National Bank Open presented by RogersWeek 5Western & Southern OpenWeek 6Winston-Salem OpenTennis in the LandWeeks 7 & 8US Open |