That leaves a big hole on the U.S. team as it prepares for the world championships this summer and begins looking ahead to the 2016 Rio Olympics.
The U.S. has plenty of top swimmers back from its London team, including Ryan Lochte, Missy Franklin and Allison Schmitt. Also, there are some top prospects on the horizon, such as teenagers Ryan Murphy, Lia Neal and Kevin Cordes.
“It’s time for other people to step it up,” said Lochte, an 11-time Olympic medalist who plans to keep swimming at least through the Rio Games.
The next big meet is this summer’s world championships in Barcelona, where the Americans figure to have plenty of star power.
On the men’s side is Lochte, who won five medals in London and recently resumed full-time training after wrapping production of his reality television show. While admittedly not in the best shape, which was evident from his lackluster performance at the Charlotte Grand Prix last weekend, his passion for swimming hasn’t waned.
“As long as I’m stepping on the blocks, I’m going to race,” Lochte said.
The women figure to be led by their two biggest stars from the last Olympics, Franklin and Schmitt.
Franklin just turned 18 and is finishing her senior year of high school in Colorado. In London, she swam in seven events and claimed five medals.
Franklin plans to remain an amateur for two more years while swimming at the University of California, then turn professional a year before the Rio Olympics. Schmitt also passed on the chance to cash in on her performance in London, where she won three golds and a silver, returning for her senior year at the University of Georgia.
After leading the Bulldogs to the women’s national championship, the 22-year-old turned pro before the Charlotte meet. She’s also resumed training with
Bob Bowman, who was Phelps’ longtime mentor and will be leading the U.S. men’s team at the world championships.
Going back to college was the right move for Schmitt, who hopes to start challenging in the 100 freestyle after competing in the 200 and 400 free in London.
“It was definitely a different atmosphere,” she said. “People say the Olympics are a high, and I had trouble coming back down from them. But having the team there for me, supporting me the whole way, and jumping back into the college season definitely helped me out a lot.”
Murphy hasn’t even gotten to college yet, but he’s already one of the rising stars for the next Olympic cycle.
Only 17, he challenged for a spot on the 2012 team, finishing fourth in the 200-meter backstroke and sixth in the 100 back at last summer’s U.S. trials, where the top two finishers made it to London. Now a senior at Bolles High School in Jacksonville, Fla., Murphy expects to keep progressing in the back - his best stroke - and could become a factor in both freestyle and butterfly by the time of the Rio Games.
“I don’t think it’s impossible to have another Michael Phelps,” Murphy said. “I don’t necessarily think it’s me. But I’m going to work hard and try to improve my other strokes.”
Claiming a spot on the U.S. team that goes to worlds would be a huge step in Murphy’s development. The squad will be selected at next month’s national championships in Indianapolis.
“You can’t go into it thinking you don’t have a shot,” Murphy said. “I’m confident there’s a chance I could make it. Obviously, I might need a little bit of help. Somebody might have mess up a little portion of the race and I will have to step up. But I think I can step up.”
While most members of the Olympic team have resumed swimming since London, Phelps and a few other big names either retired or decided to take an extended break.
Longtime breaststroke stalwarts Brendan Hanson and Eric Shanteau have apparently called it a career, setting the stage for a swimmer such as Cordes to fill the void. He just missed out on the last Olympics, finishing third at the trials in the 200 breast.
In addition, women’s breaststroke star Rebecca Soni is taking the year off and hasn’t decided whether the move is permanent.
But it’s Phelps, of course, who left the biggest hole.
“We relied on him so much, just his consistent winning,” said Jessica Hardy, who won two relay medals in London. “It will be interesting to see how we do without him ... the level of professionalism that’s missing now. He just set such a good example for hard work. I was lucky to have swum with him. It rubbed off on me just getting to watch him do all his miracles and stuff. I’m really appreciative of that.”