Day 4 summary of the 2000 Sydney Olympics

Highlights from September 18 - day four of the Sydney Olympics.

WHAT HAPPENED ON SEPTEMBER 18, 2000 - DAY FOUR OF THE SYDNEY OLYMPICS

Swimming - Ian Thorpe was defeated by Dutchman Pieter van den Hoogenband in the men's 200m freestyle by half a second. It was the only time someone beat Thorpe in a final of the 200m freestyle in a major competition. Thorpe gained revenge four years later in Athens.

Leisel Jones took silver in the women's 100m breaststroke at the age of 15 years and 19 days, becoming the youngest medallist of the Sydney Games. It was her first of nine Olympic medals, an Australian record she still shares with Thorpe.

Michael Phelps made his Olympic debut in the heats of the 200m butterfly in Sydney. He eventually finished fifth a day later in the final at the age of 15 years and 81 days. Phelps went on to dominate the sport right through to the 2016 Rio Games. He holds the Olympic records for most gold medals (23) and most overall medals (28).

Judo - Hungarian-born Maria Pekli claimed bronze in the women's 57kg event, becoming the first and only Australian woman to win an Olympic judo medal.

Artistic gymnastics - China won gold in the men's team event for the first time, after claiming silver in 1984, 1992 and 1996. They would go on and win this event again in 2008 and 2012.

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