Kate interacts with another spectator as she sits in Court One to watch a Women's singles match of the Wimbledon in London on Tuesday. Kirsty Wigglesworth / AP
Spectators at Wimbledon on Tuesday were surprised to see Kate, the Duchess of Cambridge, watching a British wildcard competing on the lowly outside courts.
In a rare move Kate, a member of the royal family visiting the All England Club, left the plush confines of the Royal Box at Wimbledon to watch Harriet Dart take on Christina McHale.
Kate took her place in among the 318 regular seats on Court 14.
Wearing sunglasses and a white dress, Kate sat alongside Britain's Fed Cup captain Anne Keothavong and British number three Katie Boulter.
Despite the photographers packed in on the three rows of seats opposite, most spectators seemed completely unaware that they were mixing it with royalty.
Access to the grounds to watch matches on the outside courts costs £25 ($31.50, 28 euros), while the Centre Court tickets cost £64 and the Royal Box is invite only, with a strict dress code.
Other guests in the Royal Box on Tuesday included Queen Elizabeth's cousin Prince Michael of Kent, former England cricket captain Geoffrey Boycott, former Bank of England governor Mervyn King and Federer's parents.
Kate's relatives in the Middleton family are frequent visitors to the All England Club, often getting an invite into the Royal Box.
Tuesday's Centre Court programme featured title holder Angelique Kerber followed by multiple former champions Roger Federer and Serena Williams.
But before those matches got under way, Kate stepped out to watch British number four Dart, the world number 182, take on the US world number 108 McHale, a lucky loser from qualifying.
Kate, 37, a long-time tennis fan, became the official patron of the All England Club in 2017, taking over from her husband Prince William's grandmother Queen Elizabeth II.
Kate watched as Dart lost the first set 4-6, but after the duchess left, the Briton turned things around to win the match 4-6, 6-4, 6-4.
Dart found out that Kate was courtside was at the start of the match.
"I was aware. The chair umpire mentioned it before the coin toss. It's pretty cool to have royalty watching you. Such a privilege for me for her to get to see me play," the 22-year-old said.
"It's pretty surreal." Despite the turnaround in form after Kate left, Dart said the presence of royalty had not inhibited her.
"I don't even know at which point she left," she said.
Dart has never met Kate and guessed she came to see her compatriot in action.
"Hopefully (it was) because I'm British. Hopefully she'll come to many more of my matches."
The 37-year-old Swiss can clinch a record-extending 21st major if he manages to break free of the world number one's stranglehold.
Nadal emerged triumphant that day, winning in five sets in a four-hour 48-minute epic of fluctuating fortunes that stretched out over seven hours because of constant, momentum-shifting rain interruptions.
It was only four minutes longer than it took Roger Federer to defeat Alejandro Falla of Colombia in 2004.
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