EUGENE, Ore. - With water ponding on the track and the finish line in plain sight, 10,000-meter runner Galen Rupp waved to the crowd, smiled and stuck out his tongue.

Catching a bit of rain. And soon, he'll be catching a plane to London.

Running in the pouring rain Friday, Rupp still set an Olympic trials record, finishing in 27 minutes, 25.33 seconds to make his second Olympics.

"I wasn't worried about it at all," said Rupp, who often has to wear a mask when he runs to keep his allergies from acting up. "I'm from Oregon. I love running in this weather. It's good for my allergies. I was excited to see it was really raining."

His was the most impressive performance on opening day in rainy Eugene, save possibly for the effort decathlete Ashton Eaton put in. Eaton made it through the first five events on pace to break a 20-year-old American record held by Dan O'Brien.

In the women's 10K, Amy Hastings won in 31 minutes, 58.36 seconds to get the Olympic spot denied her when she finished fourth by 1:11 at the marathon trials earlier this year.

While the long-distance runners and decathletes were grinding, the sprinters used Day 1 to warm up - not a bad idea considering the wet chill that gripped Hayward Field all day long, leaving puddles on the track and turning parts of the infield mushy.

Sanya Richards-Ross, LaShawn Merritt, Allyson Felix and Carmelita Jeter all made it through their opening heats with minimal problems.

Jeremy Wariner, the 2004 Olympic champion, also advanced to the semifinals, though his race wasn't quite such a breeze. He finished third in his heat in a time of 45.84.

In the women's 100 hurdles, Dawn Harper, the defending Olympic champion, won her heat in 12.79 seconds.

Lolo Jones also qualified but not by much. She finished third in her heat for the last automatic qualifying spot after running 13.01. Her race was delayed when Shericka Ward false started.

Rupp will be joined on the 10K team by Matt Tegenkamp (27:33.94) and Dathan Ritzenhein (27:36.09).