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Swimmers train at the U.S. Olympic swimming trials, Saturday, June 25, 2016, in Omaha, Neb. (AP Photo/Mark J. Terrill)
The U.S. swimming trials have been a huge success in landlocked Nebraska.
That doesn't guarantee a return to Omaha in 2020.
Chuck Wielgus, the executive director of USA Swimming, said the selection of the next host city will be affected by the dates of the Tokyo Games.
The next Summer Olympics will begin on July 24, nearly two weeks earlier than this year's Rio Games, which start on Aug. 5. The swimming competition is generally held during the first week of the games.
Wielgus said most American coaches prefer to hold the trials about 30 days ahead of the Olympics, which they feel provides enough time for resume the hard training needed to peak again at the games.
"The single biggest factor to Omaha staying as home for our trials ... is the timing," Wielgus said.
An earlier start of the trials could cause a conflict with the College World Series, which is also held annually in Omaha.
"If we stay to form, we would want to push our trials back two weeks," Wielgus said. "Boom, we're right on top of the College World Series."
Even so, USA Swimming will surely do its best to keep the trials in Omaha, where they will be held for the third straight quadrennial beginning Sunday. A temporary pool inside the CenturyLink Center provides a dynamic atmosphere, and every session for this year's meet is already sold out.
More than 200,000 tickets were sold for the eight days of competition, eclipsing the total of 167,000 in 2012 and 160,000 in 2008.