The three quarter of a mile race is one of the highlights of the 132-year-old Thames Punting Championship event, which has been held at Maidenhead for the last 32 years.
Spokesman Peter Williams said: “No-one actually saw him fall in because he was out of sight when he got hit by a wave. It definitely did not put him off though.”
Crows gathered all day along River Road to see the racing. The event followed the previous day’s Maidenhead Regatta.