Athens, Greece ? Michael Phelps grabbed his head in disbelief, then thrust his left fist in the air.

The first one’s out of the way.

He’s an Olympic champion — just like Mark Spitz.

Phelps began his quest to overtake Spitz’s 1972 record haul of seven gold medals with a dominating performance in the 400-meter individual medley, breaking his own world record Saturday night and claiming the first U.S. gold medal of the Athens Games.

Ian Thorpe won his second straight gold in the 400 freestyle — a race he got into only through the generosity of an Australian teammate — but Jenny Thompson was denied her record-tying ninth gold medal when she gave up the lead to Australia on the final leg of the 400 free relay.

“It was a change of pace for me to be passed by someone,” Thompson said. “It’s usually the other way around.”

Still, it was a good night for the powerful American team, which began eight days in the Olympic pool with a 1-2 finish. Phelps touched the wall in 4 minutes, 8.26 seconds, while teammate Erik Vendt was more than 31/2 seconds behind but good enough for silver at 4:11.81.

“I’m a little bit less nervous,” said Phelps, 19, of Baltimore. “I’ve got one off my shoulders and can relax a little bit.”

It was a rousing start to the much-anticipated Olympic meet, but Phelps is just getting warmed up. He will likely swim in eight events, giving him a chance to break Spitz’s record at the Munich Games.

U.S. swimmer Michael Phelps smiles while holding the Olympic gold medal he won after setting a world record in the 400-meter individual medley. Phelps won his first gold Saturday in Athens, Greece.

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So far, Phelps is following the script of the greatest swimmer in Olympic history. All seven of Spitz’s wins were in record time.

Thorpe almost missed the 400 free — his best event — when he inexplicably fell off the starting block at the Australian trials, earning an automatic disqualification. But he got in when teammate Craig Stevens gave up his spot.

Thorpe barely held off another countryman, Grant Hackett, to win in 3:43.10. American Klete Keller took bronze for the second straight Olympics, setting an American record of 3:44.11.

“I didn’t realize how much this event meant to me,” said Thorpe, who fought back tears after touching the wall. “I am more excited now that it is off my shoulders.”

Thompson, 31, had a chance for her ninth gold when she dove into the water for the anchor leg with a lead of nearly four-tenths of a second.

But the greatest relay swimmer in U.S. history couldn’t hold it. Jodie Henry passed Thompson after they made the final turn nearly in unison, touching the wall in 3:35.94 to break the world record of 3:36.00 set by Germany two years ago.

The winning team included Alice Mills, Lisbeth Lenton and Petria Thomas, but it was Henry who did the bulk of the work. She swam nearly a second faster than Thompson with a stunning time of 52.95 for the final 100.

Thompson swam her 100 in 53.77 — best of the American swimmers and enough to give the team a national record of 3:36.39. The Netherlands took bronze in 3:37.59.

“We were so close,” Thompson said. “We set a new American record. I think that’s pretty cool.”

In the night’s other final, Yana Klochkova of Ukraine won her second straight 400 individual medley at the Olympics, holding off American Kaitlin Sandeno by just the length of a hand.

The two swimmers made the final turn in virtually a dead heat, but Klochkova got to the wall first to become the first two-time winner of the women’s 400 IM in Olympic history. Klochkova, the world-record holder, took gold in 4:34.83 — just 12-hundredths of a second ahead of Sandeno.

Sandeno, of Lake Forest, Calif., was happy with an American record of 4:34.95, while Georgina Bardach of Argentina claimed the bronze in 4:37.51.

“I feel excited,” Sandeno said. “It’s my best time by 51/2 seconds. I wasn’t even upset that I got outpunched.”

Phelps was clearly locked in as he strolled on deck with a towel around his neck, using it to wipe down the starting block. He stripped off his warmup suit, took off his headphones (after listening to a raucous Eminem song) and stared down the 50-meter strip of water.

“He seemed like he was pretty intense,” said Phelps’ coach, Bob Bowman. “Mentally, he knows what he’s up against.”

The first gold was easy enough. Phelps had a body-length lead after the butterfly, stretched it to more than three seconds during the backstroke and cruised to victory in the breaststroke and freestyle.

His only challenger was the clock. After touching the wall, Phelps turned quickly toward the scoreboard to see his time — 0.15 better than the record he set last month at the U.S. Olympic trials.

After a moment of apparent disbelief, he swam across a couple of lane ropes to give Vendt a hug.

“We have one main goal, and that’s to emerge as the most dominant Olympic men’s team in history,” Vendt said. “When he saw I got second, it seemed he was more excited about that than his own race. It just shows the kind of guy Michael is. He’s a team player.”

During the medal ceremony, Phelps seemed a bit baffled about where he was supposed to stand before getting his award. But he’ll probably have plenty of practice over the next week.

He climbed the podium and leaned over to have a gold medal draped around his neck and an olive wreath placed on his head. During “The Star-Spangled Banner,” Phelps removed the wreath and held it over his heart — much like he would a baseball cap — and quietly mouthed the words. “I was sitting back enjoying how happy he was,” Bowman said. “I don’t think I’ve ever seen him that happy.”

Phelps said all along that one gold would make him happy. He sure seemed to mean it as he strolled around the deck, proudly holding up his medal as he posed for photographers.

“My goal is right here,” he said, showing off the medal yet again. “I’m perfectly happy. Coming in, I said I wanted one gold medal, and now I have one gold medal.”