The Austrian Thomas Muster collapsed on court after defeating Italy's Andrea Gaudenzi 6-3 7-6 in the Monte Carlo Open semi-finals yesterday. Muster, who frequently staggered with exhaustion in the heat during the final tie-break, lay on his back for some time, but was finally able to make his way unaided to the side of the court. He had first called for medical attention at 1-1 in the second set of the match. Even after treatment the Austrian was clearly in distress. But he then managed to move 5-3 ahead before the 14th seed Gaudenzi pulled back and looked set to take the match into a third set as he led 5-2 in the tie-break. But Muster took the next five points for victory, before going to hospital for treatment. Assuming he recovers, Muster will meet Boris Becker in today's final. Becker defeated Goran Ivanesevuc in yesterday's other semi-final.