A trans swimmer and senior at the University of Pennsylvania, who previously spent three years competing as a man, smashed two US records while competing at a weekend contest, sparking fresh claims of unfairness.

On Sunday, Lia Thomas, 22, put in an astounding performance at the Zippy Invitational Event in Akron, Ohio, that saw her finish the 1,650 yard freestyle 38 seconds ahead of her teammate Anna Sofia Kalandaze.

Thomas’s winning time was 15:59:71, with her UPenn teammate Anna Kalandaze coming second with a time of 16:37:44.

Thomas’s win was a record for the Zippy Meet, and the pool where the event took place. But she also managed to smash two US women’s swimming records during earlier races at the same event.