Kate and William wave Andy Murray to victory

Tennis fans the Duke and Duchess of Cambridge showed their support for Andy Murray, joining in with a Mexican wave as the Scotsman took on Spain's Nicolas Almagro in the men's singles quarter finals.

And the gesture worked – with Andy emerging triumphant, winning over two sets by 6-4 6-1.

It was a very different story from the last time Kate watched Andy play on Centre Court.

The Duchess could hardly hide her disappointment as Andy lost out in the Wimbledon final to Roger Federer.

This time the brunette royal looked delighted, applauding with her husband as Andy emerged triumphant at the All England Club.

Kate looked elegant in the electric blue £515 Stella McCartney dress which she recently wore for an exhibition opening at the National Portrait Gallery.

She teamed it with her new Smythe navy blazer with gold buttons that she has worn to two Olympic events already this week.

The Duke and Duchess of Cambridge returned to Wimbledon on Thursday to cheer on Andy Murray to victory in the men's singles quarter finals against Nicolas Almagro of Spain 

During the match the couple got into the supportive spirit and joined in with a Mexican wave 

William and Kate are known tennis fans and have previously cheered on the Scotsman during the Wimbledon tournament, where he lost in the final against Roger Federer 

They jumped out of their seats when the Team GB tennis player clinched victory in an emphatic two sets, winning by 6-4 6-1 

Kate looked elegant as ever in the electric blue £515 Stella McCartney knee-length dress she wore to the opening of the 'The Road To 2012: Aiming High' exhibition at the National Portrait Gallery (right).

For this ocassion she teamed it up with her favourite Smythe navy blazer 

At times, the Duchess watched on with tense expressions as Andy suffered a little in the fourth game 

The Duke and Duchess looked relaxed as they chatted to each other during the match 

Andy Murray celebrates after defeating Nicolas Almagro