ITALIAN Andrea Gaudenzi stunned doubles partner and fellow 'cone-head' Goran Ivanisevic 3-6, 6-1, 6-4 to storm into the semi-finals of the US$760,000 Marlboro Championships last night at Victoria Park. The 19th-ranked Gaudenzi and top seed Ivanisevic had shaved their heads on Wednesday to fulfil a secret bet they contracted six months ago. But there were no deals to be made last night as law student Gaudenzi took advantage of the Croatian's sporadic concentration lapses to win the Silver Group, which also included Frenchman Henri Leconte. In a match that was more fun than competitive, with Ivanisevic being especially animated, the two friends concluded the night's play by rubbing their bald heads together. Said Gaudenzi: 'I played alright, but it was a relaxed match. It was good to have a bit of fun because that's what it's all about. 'We are good friends, but we are used to playing each other. Goran wins more times than me, but it's been a fun week for both of us.' Gaudenzi now takes on Aussie powerhouse Mark Philippoussis, who on Thursday won the Red Group. In the other semi-final, Sweden's defending champion Stefan Edberg takes on Spaniard Sergi Bruguera. Bruguera out-duelled American Patrick McEnroe in three enthralling sets yesterday. Both players slugged it out from the back of the court in a two-hour battle which had some of the best rallying seen so far in the tournament, featuring a range of well-executed groundstrokes and outrageous recovery shots. Bruguera prevailed 7-5, 6-7 (4-7), 6-4 to win the Blue Group, having already defeated Holland's Jacco Eltingh in his opening match. The world number 10 went into the match expecting a long baseline battle. McEnroe obliged as both players chased balls from all corners of the court. 'I'm not surprised it was a tough match. Patrick is a great hardcourt player and I knew I'd be in for some long rallies,' said Bruguera, who was earlier this week suffering from a fever as a result of a throat problem. 'I'm not in the best shape at the moment, but I do feel much better than I did before. 'Although there are no ranking points in this tournament, to play matches and win does a lot for your confidence. 'If I keep winning I feel that my game is getting better.' The two-time French Open champion, who missed more than four months of the season because of a ligament injury, joins a powerful lineup in today's semi-finals. But he believes he has a good a chance as any to lift the Hong Kong title and take home the winner's cheque of US$220,000. 'All the players are tough in the semi-finals,' he said. 'Philippoussis is playing great tennis and Edberg is also a good player. McEnroe had the early advantage yesterday, breaking Bruguera to go 3-2 up in the first set. But Bruguera broke back when McEnroe was serving for the set and overcame the American's serve again two games later to take the set. McEnroe had the sympathy of the crowd after they felt he was subjected to a particularly harsh line call. The second set was a near carbon copy of the first, up to the stage when Bruguera held match point while 6-5 up on McEnroe's serve. The American was not about to let one hour of hard work go to waste, eventually holding his serve and winning the tie-break. The Spaniard, however, broke in the first game of the deciding set and held on to his advantage to emerge the winner.