![Darron Cummings Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)](https://mapi.associatedpress.com/v2/items/3c62b39811d842899e19a44b7147cc74/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)
![Darron Cummings Aaron Shackell reacts after winning the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)](https://mapi.associatedpress.com/v2/items/25b209a840f045278a4a6f9e94dd876c/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell reacts after winning the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)
![Michael Conroy Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapoils. (AP Photo/Michael Conroy)](https://mapi.associatedpress.com/v2/items/df23a84af3db4e239f1b2df2772c0f50/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapoils. (AP Photo/Michael Conroy)
![Michael Conroy Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapoils. (AP Photo/Michael Conroy)](https://mapi.associatedpress.com/v2/items/3a9131d9c42641f5aea428b982ac1321/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell reacts after winning the Men's 400 freestyle finals Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapoils. (AP Photo/Michael Conroy)
![Darron Cummings Gretchen Walsh and Alex Shackell watch results after the Women's 100 Butterfly Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)](https://mapi.associatedpress.com/v2/items/394cce157c9c44c68e4dbaa7ddc1ba4b/preview/preview.jpg?s=680x&wm=false)
Gretchen Walsh and Alex Shackell watch results after the Women's 100 Butterfly Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)
![Darron Cummings Aaron Shackell reacts after winning the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)](https://mapi.associatedpress.com/v2/items/e479872b829b45b7b99e7490cf2e0dcb/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell reacts after winning the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Darron Cummings)
![Michael Conroy Aaron Shackell swims during the Men's 400 freestyle preliminaries Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)](https://mapi.associatedpress.com/v2/items/4881da8fd95e4e53947c3c3b845baa59/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell swims during the Men's 400 freestyle preliminaries Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)
![Michael Conroy Aaron Shackell swims during the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)](https://mapi.associatedpress.com/v2/items/26905fd8ba8e497da17cdc543c98a728/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell swims during the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)
![Michael Conroy Aaron Shackell swims during the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)](https://mapi.associatedpress.com/v2/items/659d6ec250b64ac9a3fbd7b6c75a3acf/preview/preview.jpg?s=680x&wm=false)
Aaron Shackell swims during the Men's 400 freestyle finals heat Saturday, June 15, 2024, at the US Swimming Olympic Trials in Indianapolis. (AP Photo/Michael Conroy)