Roger Federer is put through his paces after winning the first set, as Nikolay Davydenko serves a string of winners

Fifth seed Davydenko continues to push Federer in the quarter-final forcing errors out of the Swiss world number one

After a tough four-set match, Federer waves goodbye to his opponent and says hello to Nicolas Kiefer in the semi-final

Nicolas Kiefer opens up play on day 10 against Sebastien Grosjean and stays focused as he takes the first set

Sebastien Grosjean rallies to get himself back into the match and takes the second set without losing a single game

Australian boxer Kostya Tszyu watches the battle between Kiefer and Grosjean at the Rod Laver Arena

Sebastien Grosjean argues with referee Mike Morrissey after Kiefer throws away his racquet and tempers fray

Kiefer takes in the moment in Melbourne after reaching his first major semi-final at the 35th attempt

Amelie Mauresmo unleashes another powerful serve in her quarter-final win over Patty Schnyder

Martina Hingis grimaces as Kim Clijsters takes a 4-0 first-set lead and wins it 6-3

Hingis turns the tables in the second set, but Clijsters digs deep to finish off the three-time Australian Open winner

British comedian Billy Connolly is among the enthralled spectators watching Clijsters defeat Hingis 6-3 2-6 6-4