The German is ranked 99, has been as high as no 5 back in 2004. At his peak back then, when he made the Aussie Open final (2003), he was possibly the fittest player on tour...not a huge hitter but extremely fast around the court
They've played once before, in Memphis back in 2006 when Andy shrugged off a poor start to win 1-6, 7-5, 6-2
Andy's match is second on Centre Court, not before 5:30pm (2:30pm UK time) meaning it will be live on Eurosport and the eurosport livestream (found at www.eurosport.yahoo.co.uk I believe)
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