07/04/2012 at 10:00 AM EDT
It's a love match for Prince William
, who looked happy and relaxed sitting together courtside Wednesday at Wimbledon.
Kate – donning the Alexander McQueen sailor-style outfit she wore one year ago during their visit to Charlottetown, Canada
– and her husband watched from the royal box as Switzerland's Roger Federer beat Russia's Mikhail Youzhny in straight sets on the famous Centre Court.
The royal couple stayed for Wednesday's quarter final match between Britain's Andy Murray and Spain's David Ferrer.
William and Kate visited the championships to catch Murray's match against Frenchman Richard Gasquet.
A passionate tennis player herself, Kate is the last of the Middletons to attend the tennis tournament this year. Her parents Mike and Carole were in the royal box Tuesday, while sister Pippa and brother James made their Wimbledon appearance