Shane Gould

Shane Gould remains the only swimmer in history—male or female—to hold every world freestyle record simultaneously, from 100m through 1500m, at just 15 years old. She retired at 16 after setting 11 world records, a career so condensed it rivals Ryan Lochte's longevity but with higher peak achievement. Her induction into the International Swimming Hall of Fame in 1977 cements her as one of the most prodigious talents the sport has produced, with a medal efficiency of 75% in Olympic finals.