Croatia's Goran Ivanisevic arrived at the Olympics looking tanned, rested and rusty.
He took 20 days off after Wimbledon and paid the price Wednesday, losing to South Africa's Marcos Ondruska 6-2, 6-4. The biggest upset of the first round took just one hour to play.
"I gave my best today," said Ivanisevic, who won bronze medals in singles and doubles in Barcelona. "It was poor, but that was the best I can give at the moment."
Ivanisevic, seeded second behind Andre Agassi, lost to a player whose ranking has slipped to 104th from 27th in the past three years.
Despite trademark Ivanisevic serves, booming in at more than 120 mph, Ondruska broke him twice in the first set and once in the second. Ivanisevic had eight double-faults and six aces, compared with one double-fault and six aces for the South African.
Ondruska has defeated Michael Chang and Michael Stich in the past but had not scored a big victory in three years.
"After three years of good but not really decent wins, today was obviously a great win for me," he said.
Ivanisevic still has a shot at a medal in doubles. He and Sasa Hirszon play their opening match today.
Paul Haarhuis, the 12th seed, was the other upset victim on the men's side, going out to big-serving unseeded Australian Mark Philippoussis 7-6 (7-4), 7-6 (7-2.) Philippoussis served 17 aces.
Wimbledon finalist MaliVai Washington also advanced with a 6-3, 7-6 (7-3) victory over Slovakia's Jan Krosklak. But he was having as much fun being a spectator as competing.
"Any player who is not here in Atlanta," Washington said, "they are not having as much fun as I am.
"I have seen some judo and some judo and some baseball. I saw Korea and Italy. I didn't even know Italy had a baseball team. I'd like to go see some of the aquatic events. I don't know what it is, but people go nuts over it. It is absolutely amazing. I want a chance to see some of the badminton."
Thomas Enqvist, the No.
3 seed from Sweden, faced a barrage of 24 aces from Marc-Kevin Goellner of Germany before winning 7-6(7-4), 4-6, 6-4.
On the women's side, seeded players Conchita Martinez of Spain, Anke Huber of Germany and Mary Pierce of France advanced easily to the second round.