The intial record of 50.73 was set Joanne Cuddihy's and has stood for 15 years, until now.
I was in Osaka when Joanne Cuddihy ran 50.73 at the 2007 World Championships and remember thinking that Irish record will stand for a while. 15 years later, still aged 19, @rhasidatadeleke has run 50.70 and I'm thinking that record won't last for long. https://t.co/TfDHQoLFuS
— Ian O'Riordan (@ianoriordan) May 16, 2022
The Dubliner finished third behind Stacey Ann Williams and Kennedy Simon.
The 19-year-old is now the fastest Irishwoman of all time at 60m, 200m, 300m and 400m distances. She has been in Texas since January 2021.
Four other Irish records were broken over the weekend.
Louise Shannahan set a new 800m of 1:59:42 at the Belfast Irish Milers meet; Eric Favors had a new Irish shot put throw of 20.07 metres in Puerto Rico; Dean Casey broke the Irish U20 10,000m record in 28:57:34; while Sarah Healy smashed the Irish U23 mile record as she clocked 4:29:03.