Chest pain puts Sun on shelf

China's champion withdraws from 1500 freestyle final

Sun Yang's stunning last-minute withdrawal from Sunday's 1500m freestyle final because of a heart problem cast a shadow over the last night of the world swimming championships.

China's world record-holder and Olympic champion confirmed his 11th-hour decision to quit was made after having chest pains during the warm-up, and his sudden withdrawal caught FINA officials by surprise.