Six Grand Slam singles champions entered the mixed doubles draw at the 2026 US Open.
The mixed doubles field included players who had already won major singles titles, adding substantial experience to a short-format competition. The event began on August 24 and used four rounds, unlike the full-length singles tournaments.
The mixed doubles title was won by Karolína Muchová and Jakub Menšík. They defeated Belinda Bencic and Flavio Cobolli in the final, which was decided by a match tiebreak after the teams split the first two sets.
A Grand Slam singles champion is not the same as a Grand Slam doubles champion. The statistic specifically counts entrants with at least one major singles title, so it excludes players whose major success has come only in doubles or mixed doubles.