David Cameron said he hoped Andy Murray would add the Wimbledon title to the British and Irish Lions' "superb" series win over Australia to give the country a "perfect sporting weekend".
"A superb result for the British and Irish Lions," the Prime Minister wrote on Twitter.
"Hoping Andy Murray can make it the perfect sporting weekend."
Mr Cameron is expected to be among the spectators at Wimbledon's Centre Court on Sunday when Murray takes on the world's number one tennis player Novak Djokovic in the final in a bid to end Britain's 77-year wait for a men's champion.
Downing Street will fly the Scottish Saltire to mark the occasion.
The Lions put in an awesome display of scrummaging power to build an unshakeable victory foundation, with England prop Alex Corbisiero scoring an early try, fly-half Jonathan Sexton, wing George North and centre Jamie Roberts also touching down and brilliant full-back Leigh Halfpenny kicking 21 points.
Australia, 19-3 behind just before half-time, rallied to within three points six minutes into the second period courtesy of a James O'Connor try and 11 points from goal-kicking centre Christian Leali'ifano.
But the Lions were not to be denied as they took the series 2-1, savouring a triumph they last experienced against South Africa in 1997