Mollie O'Callaghan sets a world record at the swimming worlds and overcomes injury
The 19-year-old O'Callaghan broke the world record on Wednesday in the 200-meter freestyle at the world championships, clocking 1 minute, 52.85 seconds to erase Federica Pellegrini's mark of 1:52.98 -- the oldest women's record set in 2009 in the fast-suit era.