Eric Shanteau is heading back to the Olympics, too, and this time he doesn't have to worry about battling cancer. He rallied to finish second to Hansen.
Four years ago, Shanteau beat out Hansen for an individual spot on the team shortly after being diagnosed with testicular cancer. He put off treatment until after the Games and has been healthy ever since.
Dana Vollmer, a gold medalist as a teenager in 2004, missed out on the team four years ago while battling injuries. Tuesday night, she got off to a blistering start in winning the 100 butterfly.
Natalie Coughlin missed on her first attempt to make her third Olympic team. She finished next-to-last in the eight-woman race in 58.66 seconds.
But the two-time defending Olympic champion in the 100-meter backstroke grabbed the next-to-last spot for Wednesday night's final in that event. Missy Franklin, the 17-year-old budding star who idolizes Coughlin, qualified fastest in 59.06 seconds.
Janet Evans was far off the pace in her return to the trials, failing to qualify for the final of the 400-meter freestyle.
Evans, 40, finished 80th among 113 swimmers in the event in which she won one of her three gold medals as a 16-year-old phenom in the 1988 Seoul Olympics.
And there was another memorable race between Ryan Lochte and Michael Phelps. One night after Lochte beat Phelps in the 400 individual medley, Lochte edged him out again in the semifinals of the 200 freestyle. The final is Wednesday night.
Hansen rallied over the final lap for a time of 59.68 seconds, giving him a chance to make up for the disappointment of the last two Olympics. He was one of the world's top breaststrokers leading up to both Athens and Beijing, and ended up with individual silver and bronze medals in Athens and relay gold in Athens and Beijing.