Pan Pacific champ Ikee qualified second fastest for the evening's 100m butterfly final as she clocked 57.68 seconds, 13 hundredths behind China's Zhang Yufei.
The graceful 18-year-old, who lit up the recent Pan Pacific swimming championships in Tokyo, is expected to be a serious force in the 100m fly and 100m free at the 2020 Olympics in her home city.
Dressel joined forces with Phelps in the latter's final Olympics in Rio two years ago to win gold in the 4x100 metres freestyle relay.
Ledecky was 15 when she led wire-to-wire in winning the 800m free in London in a race that saw world record holder and British home hope Rebecca Adlington relegated to third.
The British swimmer stopped the clock at 57 seconds dead as he obliterated both his rivals and his own previous best mark of 57.13 seconds, which he set on the way to winning Olympic gold at Rio 2016.
Peaty is undefeated in the 100m for four years, but a time of 58.84 seconds left him disappointed and well short of his own world record.
The 2016 Rio Olympics silver medalist improved on the world record of 58.10 set by Canadian Kylie Masse at the World Championships in Budapest on July 25 of last year.
While USADA said Lochte was not using a banned substance, athletes can typically only receive IVs as part of hospital treatment or through an exemption.
About 2,400 swimmers took part in the Samsung Bosphorus Cross-Continental Swim, organised by the Turkish Olympic Committee, for the 30th race since the tradition began in 1989.
The 26-year-old beat the previous record of 22.43 established by Spain's Rafael Munoz Perez in 2009.
Seven Qatari swimmers will attempt to swim across the English Channel in July.
Four-time world medallist Magnini won the 100m freestyle at the 2005 and 2007 world championships and a relay bronze at the 2004 Athens Olympics.
Last December, Hosszu said that their relationship was "undergoing trials," and attended separately a Hungarian sports gala where Tusup pledged that he "would work to change".
Koga denied taking the substances knowingly but admitted taking a diet of supplements which could have been to blame. He now faces a maximum ban of four years.
Kukors Smith alleged in the lawsuit, filed in Orange County Superior Court near Los Angeles, that Sean Hutchison, her coach at a swim club near Seattle, began grooming her for a sexual relationship at age 13.