Croatia's Ivo Karlovic serves against Radek Stepanek of Czech Republic during their first semi-final Davis Cup tennis match between Croatia and Czech Republic in Porec, some 200 kilometers from Zagreb, on September 18, 2009. Radek Stepanek won a six-hour marathon against record-breaking Ivo Karlovic to give the Czech Republic a 1-0 lead over Croatia in their Davis Cup semi-final. Stepanek defeated Karlovic 6-7 (5/7), 7-6 (7/5), 7-6 (7/5), 6-7 (2/7), 16-14, whilst Karlovic hit a world record 78 aces. Getty Images logo Getty Images 2 months ago

Croatia's Ivo Karlovic serves against Radek Stepanek of Czech Republic during their first semi-final Davis Cup tennis match between Croatia and Czech Republic in Porec, some 200 kilometers from Zagreb, on September 18, 2009. Radek Stepanek won a six-hour marathon against record-breaking Ivo Karlovic to give the Czech Republic a 1-0 lead over Croatia in their Davis Cup semi-final. Stepanek defeated Karlovic 6-7 (5/7), 7-6 (7/5), 7-6 (7/5), 6-7 (2/7), 16-14, whilst Karlovic hit a world record 78 aces.