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Omaha, Neb. • The first event of the U.S. Olympic swimming trials produced a huge stunner: Ryan Lochte failed to qualify for the team Sunday night in an event he won at the 2012 London Games.

Lochte, an 11-time Olympic medalist, raced out to a big lead on the first two legs of the 400-meter individual medley but had nothing left for the breaststroke and freestyle.

After the race, Lochte revealed that he pulled a groin muscle during the morning preliminaries, saying it left him with no choice other than to try to build a commanding lead in the butterfly and backstroke.

Chase Kalisz won in 4 minutes, 9.541 seconds, while Jay Litherland rallied to take the second spot for Rio in 4:11.021.

Lochte, his legs totally gone, labored home in third at 4:12.021.

"I had to go out faster than usual because I couldn't use my legs in the breaststroke," said the 31-year-old Lochte, who still has several other events to claim his spot on his fourth Olympic team — assuming he can overcome his injury. "I did everything I could in that race, it just wasn't enough. Just got to forget about that and move forward."

While college teammates Kalisz and Litherland celebrated, Lochte hung on a lane rope, totally exhausted. He finally made it over to the side of the pool, struggling just to climb out of the water. He said he get a cortisone shot to help deal with the pain.

"I'm going to keep working on it day in and day out, and hopefully it gets better," Lochte said. "I thought about it this morning, about scratching, but I mean, it's the Olympic trials. If I had a broken leg, I'd still go out there and swim."

Diving

Indianapolis • David Boudia will dive for another Olympic medal in Rio after winning the men's 10-meter Sunday in the U.S. Olympic diving trials.

The defending Olympic champion in the event won with a total score of 1,534.4 points.

Steele Johnson finished second with 1,475.15 points and qualified for his first individual Olympic event. Boudia and Johnson had qualified earlier this week in the synchro 10-meter.

Earlier, Kassidy Cook got a measure of redemption Sunday by qualifying for her first U.S. Olympic team in the women's 3-meter. Her good friend, Abby Johnston, who attends medical school at Duke, also made the team.

The top two finishers qualify in individual events, and the eight-day event in Indianapolis ended with a splashy duel between the top three men in 10-meter.