Olympic Rivalry: Michael Phelps Takes on Ryan Lochte

Top swimmers qualify for what could be a very competitive race at the games.
3:13 | 07/28/12

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Transcript for Olympic Rivalry: Michael Phelps Takes on Ryan Lochte
Well, the showdown between michael phelps and ryan lochte may be the biggest rivalry of the olympics. They both qualified moments ago. The big races are coming up. Just a little bit of pressure here, bill. Reporter: Just atle bit. There are land people and water people. For those of us who sink like car batteries, you can't help but stand in awe of these two guys. Phelps just barely qualified this morning. This is a rivalry of teammates. Here's the key lap for michael phelps! Reporter: There they were, less than a month ago, neck and neck, stroke for stroke. This is the scene you'll see most lickly in london. Reporter: Two water demigods. Striving to become america's aqua alpha. In the end, phelps, by 0.09 of a second. He's the reigning champ. A record eight golds from one olympiad alone. Ryan lochte, the challenger, two medals on his wall. Hungry for so much more. I've been getting second behibd him so many times. I always knew I was capable of beating him. It was matter of when. I'm here to swim as fast as i can. If I do that, that's all that matters. Reporter: Out of thepool, phelps is a machine, swims, eats, repeats. Lochte, skateboards, with a phrase, jeah. Lochte plays around. Very free. Phelps, focused, almost proe botic. Reporter: While phelps has been on covers, mostly for his hardware. Lochte, because of other wears. He's got the endorsements. Gatorade and speedo. Remember the qualifying matches from a month ago? In that race that day, lochte won the 400 meter medal by 0.83. The same ept that will scare them off today. Sfw people see the trials, they say, phelps beat him in 3 of the 4 events. You look closer. The margin of victory for phelps, 0.3 seconds. They're that close. Repr: Like a young paul newman, lochte is handsome in. You have to be sure of yourself just to do research. Dana volmer broke a record for the 100 manufacture meter butterfly today. Who made the cut? The latest news on "dancing with the stars" coming up next. schoolthere's

This transcript has been automatically generated and may not be 100% accurate.

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