In February 1920, he won the Victorian championships, and soon after broke the 1000 m world record and qualified for the 1920 Summer Olympics in Antwerp. With swimming held in a near-freezing open-water canal, Beaurepaire abandoned the 400 m freestyle mid-race due to illness, but managed to claim a bronze in the 1500 m freestyle. He combined with William Herald, Ivan Stedman and Henry Hay to claim the silver medal in the 4 × 200 m freestyle relay, some 21 s behind the American squad.