It is billed as the "Battle of the Andys".

And the 22-year-old Scot said his preparation for the showdown included watching clips of boxing and cage fighting.

Andy Murray is a superb counter-puncher, returning serves with an incredible touch.

And his reactions will need to be razor sharp to cope with Andy Roddick's thundering serve.

The 26-year-old American has the fastest serve ever recorded at the championships - 146mph in 2004.

Murray has a 6-2 winning record against his opponent.

While he is considered the up-and-coming star, Roddick is a well established figure on the tour.

He was a Wimbledon runner-up in 2004 and 2005 and is bidding to reach his third final.

The former world number one won the US Open in 2003.

Murray is looking for a place in the history books.

If he wins a place in the final he will be the first British man to make it since Henry "Bunny" Austin in 1938.

Roger Taylor made the semi finals twice, while Tim Henman played for a place in the final four times, most recently in 2002 against Australian Lleyton Hewitt. But neither of them made it to the final.

At 6ft 3in Murray is an inch taller than his rival.

And he has another advantage. The world number three eased through his quarter final against Juan Carlos Ferrero in three straight sets.

Roddick, now ranked world number six, had to battle it out against Hewitt in a five set epic.

He says he is in better shape than he was in his early twenties and he is by no means an old man.

But Murray, now known as one of the fittest men on the tour, will be hoping he has more running in his legs.

Both men are keen users of the micro-blogging site Twitter.

Roddick at least beats Murray in that regard, having "tweeted" about twice as many times during the tournament.