The US Open tennis tournament consists of a total of seven rounds: Round 1, Round 2, Round 3, Round 4 (also known as the Round of 16), Quarterfinals, Semifinals, and Finals. This structure applies to both the men's and women's singles events at the tournament.

The 2025 US Open schedule confirms these rounds with matches starting at the 1st Round and progressing through to the finals, which take place on the last days of the tournament.

Thus, the US Open tennis tournament has exactly seven rounds.