LAUSANNE, Switzerland -- World-record holder Tim Montgomery withdrew from a showdown with Olympic and world champion Maurice Greene following the birth of his son.

Montgomery returned to the United States to be with his girlfriend, Olympic champion Marion Jones, and his son and will miss the Athletissima meet, Pierre-Andre Pasche, a spokesman for the event, told The Associated Press.

Jones, who won five medals at the 2000 Olympics, gave birth Saturday night at about 10 p.m. ET at Duke University Hospital in Durham, N.C. The baby, named Tim, weighed only 5 pounds, 14 ounces but was healthy.

Montgomery, who set the world record (9.78 seconds) in the 100 meters last September, was at the Norwich Union International race in Glasgow, Scotland, when he received news of the birth early Sunday.

When Montgomery found out about the birth, he decided not to run in the Glasgow race so he could search for ways to fly home. But after an encouraging telephone conversation with Jones, he decided to run.

Despite one hour of sleep, Montgomery finished second in the 100 behind Dwain Chambers.

"We knew we'd have a fast baby, but I didn't expect him to be this fast," Montgomery said, joking. Jones' official due date was July 21. "It was very stressful for me not to be right there with Marion. We just didn't think he'd come this soon. But I'm relieved to know they are both doing very well and I can't wait to see them."

Montgomery and Greene were scheduled to race Tuesday, their first meeting since September in Paris when Montgomery took Greene's 100-meter world record, finishing in 9.78 seconds.

Before Montgomery withdrew, Greene told the Swiss daily Le Matin that he was unfazed by meeting his rival on the fast Pontaise track.

"It's all the same to me. I'd even be ready to race him on the street, if he wanted to," he said. "I'm going to win. I think I'll do it in 9.8."

Greene still faces some talented opposition, including veteran Bernard Williams, who beat him in the U.S. track and field championships, and Nigeria's Deji Aliu, who ran 10.0 in Greece last week.

Information from The Associated Press was used in this report.