Terence Atmane Upsets Frances Tiafoe at Washington Open

French player Terence Atmane defeated American sixth seed Frances Tiafoe 4-6, 6-3, 6-4 in the first round of the Mubadala DC Open in Washington on July 27, 2026. The win marked Atmane's revenge after losing to Tiafoe in the first round of Wimbledon earlier in the season. Tiafoe, a Washington‑area native and top‑20 player, had reached at least the quarterfinals in each of his previous appearances at the tournament.

The upset was the headline result of the opening day, which also saw other seeds such as Taylor Fritz and Lorenzo Musetti advance to the second round.