Swift attended the tennis championship in New York with boyfriend Travis Kelce on Sunday, four days after watching his Kansas City Chiefs open their NFL season with a victory.
The singer wore a red-and-white chequered dress for the match between American Taylor Fritz and Jannik Sinner of Italy.
Kelce was dressed in a white shirt and sweater, looking appropriately attired for Wimbledon.
The couple sat in a box at Arthur Ashe Stadium along with Patrick Mahomes, Kelce’s teammate with the defending Super Bowl champions, and his wife, Brittany.
The US Open posted a photo on social media of Swift enjoying a Honey Deuce, the tournament’s cocktail phenomenon that costs 23 dollars (£17.50).