Andy Murray says he's ready for the challenge of playing world number one Rafael Nadal in the Wimbledon semi-finals, and he reckons he can win!
Andy's been playing really well in the tournament, only dropping one set so far in his quarter-final match.
If he beats Nadal on Friday, he'll be the first British man to reach the Wimbledon final for 72 years!
The British number one says: "It will be incredibly difficult, but I believe I can win if I play well."
Andy was beaten by Nadal at Wimbledon two years ago, but he thinks he's better prepared this time around.
The 23-year-old says: "I knew after that match I had to go away, work hard and get fitter and stronger. I went away and did that."
The two have played each other 10 times in total, with Nadal winning seven times. But in the big tournaments, called the Grand Slams, they've played four matches and are level at two-all.