Looking at Summer's splits tonight vs 2023, she was a bit faster in the butterfly (0.29), a bit slower in the back (0.2), way faster in the breast (1.79), and slower in the free (0.39). So, essentially, she broke the record with a much improved breaststroke. She's already a world class free, back and butterflyer, so seeing her breast times drop so dramatically just opens the door to imagination of what the future holds for her.