Katie Ledecky lost a race!
Someone else was already there.
Pellegrini is the world record-holder in the 200 free but lost to Ledecky two years ago in Russian Federation. She got off to a blistering start and led all the way, touching in 1 minute, 4.13 seconds to shave 0.22 off the Lithuanian's mark from the 2013 worlds in Barcelona.
The Italian touched in 1min 54.73sec as Ledecky and McKeon shared silver in 1:55.18.
Ledecky said after the race that she didn't feel like herself and was "scrambling" later on. I would have liked a faster time but you can't really ask for any more. "She's certainly the greatest athlete I've ever seen".
McKeon tied for second with Ledecky. She did it in the 1,500 freestyle, winning by an awesome 19 seconds.
McKeon is likely to have swum seven events by the end of the week, with the 100m freestyle, 4x200m freestyle relay and 4x100m medley relay still to come. He finished more than a half-second ahead of American Townley Haas, while the bronze went to Russia's Aleksandr Krasnykh.
Now shes got a silver, too.
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The 28-year-old Pellegrini, who also won the world title over 200m at home in Rome in 2009 and Shanghai in 2011, said this was the last 200m freestyle of her career as she eyes retirement. "I just warmed up for that and then was just in a really good spot mentally, I think, after the mile, and could kind of just pretend going into the 200m like I didn't have the mile beforehand".
Of course, losing to Pellegrini was hardly an embarrassment. Pellegrini's incredible run in the 200 free began at the 2005 worlds in Montreal, where she grabbed a silver. The 200 is where she is most vulnerable, as her narrow victory in Rio over Sweden's Sarah Sjostrom showed.
McKeon returned in the last event of the night to combine with Mitch Larkin (backstroke), rookie Daniel Cave (breaststroke) and Bronte Campbell (freestyle) in the new Olympic event, the mixed medley relay.
"Katie Ledecky is on another planet so the goal of the race was to win the silver medal". It's hard to justify expecting world records, especially given Ledecky's workload, but it's hard not to be just a tad disappointed when Ledecky used to set world records at random in season meets.
Ledecky rallied to second by the midway point, and was just one-hundredth of a second behind the Aussie when they made the final flip. But the two leaders, having spent so much energy dueling each other, didnt have anything left for the final lap.
Her closing 50 was a blistering 28.82 almost a full second faster than both Ledecky and McKeon.
Everything seemed to be in slow motion to me in the water, Pellegrini said. "At 150 meters on the turn we were all there, so I closed my eyes".