Michael Phelps will bring down the curtain on his stellar Olympic career in Rio, heading a US swimming team packed with newcomers eager to stamp themselves the future of the sport.
Phelps and his gang of ageing warriors that includes Ryan Lochte, Nathan Adrian and Anthony Ervin have one thing in common with the 30 first timers: They all must swim faster than they did at the eight-day US trials if they want to dominate in the competition pool as they have in Games past.
US men’s head coach Bob Bowman, who has guided Phelps throughout a career that spans four prior Olympics that yielded 22 medals, 18 of them gold, believes they can. “One of the things that we have always done well, better than anyone else, is improve from the trials to the Games,” Bowman said.
“And I’m confident we’re going to do that again. And quite frankly we’re going to have to do that if we want to have the kind of Olympics that we are expected to have and want to have.”
The United States topped the swimming medals table in London 31 total, 16 gold. While the trials that concluded on Sunday produced a string of tight races and the compelling drama that comes of knowing only the top two in each event will book Olympic berths, the times were not especially fast. No world records were broken and just one American record was set by Josh Prenot in the 200m breaststroke.
Katie Ledecky, the surprise 800m gold medallist in London, underscored her freestyle dominance with victories in the 200m, 400m and 800m free while Maya DiRado won both women’s medleys and the 200m backstroke to book three individual swims in her first Olympic Games.
Phelps was the only other swimmer to win three events at trials — the 100m and 200m butterfly and 200m individual medley. “I thought his times this week were mediocre,” Bowman admitted, but added he was ‘crystal clear’ on what needed to be done in the weeks leading up to Rio to rectify that.
Based on trials times US men lead the world this year in only two events — Prenot’s 2min 07.17sec in the 200m breast and David Plummer’s 52.12 in the semi-finals of the 100m back which he failed to replicate in a runner-up finish in the final.
US women top the world rankings in four events — three of them courtesy of Ledecky and the fourth newcomer Lilly King’s 1:05.20 in the 100m breaststroke. “On the women’s side, I think there are some real strengths and I would say some significant challenges, really, event-by-event,” said David Marsh, head coach of a women’s team that features a veteran presence in defending 100m butterfly gold medalist Dana Vollmer and in Missy Franklin.
Franklin was far from the force she was in 2012, when her seven-event London slate produced four gold medals, but she qualified to defend her 200m backstroke gold and to swim the 200m free with runner-up finishes.
Both Bowman and Marsh were at a loss to explain why the times in 10 of 26 events were slower at these trials than in 2012. But Bowman said it might have something to do with the growing spectacle of an event USA Swimming officials like to call their Super Bowl.
“People know what the event is like and how big it is,” Bowman said of the meet that draws up to 14,000 spectators per session and features a light-show opening ceremony every night and fireworks at the medal ceremonies. “It’s not like a swim meet,” Bowman said. “It’s more than that.”
The hoopla only adds to the pressure of the do-or-die meeting, even for proven performers like Phelps. “If you think Michael wasn’t nervous for those races, he absolutely was,” Bowman said. “Everybody is.”
But Bowman said the quick turnaround before swimming competition starts in Rio on August 6 is to the Americans’ advantage. “Once they’re at a peak level, like they are now, it’s much easier to make small adjustments to help them improve or to try to correct some things that maybe didn’t go well here,” Bowman said.

The US swimming team for 2016 Olympics
Womens’ team
50m Freestyle: Abbey Weitzeil, Simone Manuel
100m Freestyle: Abbey Weitzeil, Simone Manuel
200m Freestyle: Katie Ledecky, Missy Franklin
400m Freestyle: Katie Ledecky, Leah Smith
800m Freestyle: Katie Ledecky, Leah Smith
100m Backstroke: Olivia Smoliga, Kathleen Baker
200m Backstroke: Maya DiRado, Missy Franklin
100m Butterfly: Kelsi Worrell, Dana Vollmer
200m Butterfly: Cammile Adams, Hali Flickinger
100m Breaststroke: Lilly King, Katie Meili
200m Breaststroke: Lilly King, Molly Hannis
200m Individual Medley: Maya DiRado, Melanie Margalis
400m Individual Medley: DiRado, Elizabeth Beisel
4x100m Free Relay: Amanda Weir, Lia Neal, Allison Schmitt, Dana Vollmer
4x200m Free Relay: Leah Smith, Allison Schmitt, Melanie Margalis, Cierra Runge
10K Open Water: Haley Anderson

Men’s team
50m Freestyle: Nathan Adrian, Anthony Ervin
100m Freestyle: Nathan Adrian, Caeleb Dressel
200m Freestyle: Townley Haas, Conor Dwyer
400m Freestyle: Connor Jaeger, Conor Dwyer
1,500m Freestyle: Connor Jaeger, Jordan Wilimovsky
100m Backstroke: Ryan Murphy, David Plummer
200m Backstroke: Ryan Murphy, Jacob Pebley
100m Butterfly: Michael Phelps, Tom Shields
200m Butterfly: Michael Phelps, Tom Shields
100m Breaststroke: Kevin Cordes, Cody Miller
200m Breaststroke: Josh Prenot, Kevin Cordes
200m Individual Medley: Michael Phelps, Ryan Lochte
400m Individual Medley: Chase Kalisz, Jay Litherland
4x100m Free Relay: Ryan Held, Anthony Ervin, Blake Pieroni, Jimmy Feigen
4x200m Free Relay: Jack Conger, Ryan Lochte,
Gunnar Bentz, Clark Smith
10K Open Water: Jordan Wilimovsky, Sean Ryan