His personal best time of 44.38 seconds, achieved at the 1988 Seoul Olympics, is the current Oceanian record.  This time would have placed Clark in second place in the 2008 Beijing olympics 400 m final. Clark also co-holds the Oceanian record in 4 x 400 metres relay with 2:59.70 minutes, established with teammates Bruce Frayne, Gary Minihan and Rick Mitchell at the 1984 Los Angeles Olympics.
Clark achieved fourth place in two consecutive Olympics, 1984 and 1988.
Clark took a break from the track in 1991, playing a season in the New South Wales Rugby League for the Balmain Tigers. Playing mostly in reserve grade, he played on the Wing, scoring 11 tries, and also competed in the pre-season World Sevens Tournament. While playing for the Tigers, Clark was billed as the "Fastest white man alive".
|1984||Olympic Games||Los Angeles, United States||4th||400 m|
|4th||4 × 400 m relay, 2:59.70 AR|
|1985||World Cup||Canberra, Australia||3rd||200 m|
|1986||Commonwealth Games||Edinburgh, Scotland||2nd||400 m|
|1988||Olympic Games||Seoul, South Korea||4th||400 m, 44.38 AR|
|6th||4 × 400 m relay|
|1990||Commonwealth Games||Auckland, New Zealand||1st||400 m|
|1993||World Indoor Championships||Toronto, Canada||3rd||400 m|
- Area Outdoor Records - Men - Oceania (IAAF)
- Commonwealth All-Time Lists (Men) - GBR Athletics
- "Darren Clark". Sport Australia Hall of Fame. Retrieved 1 October 2013.
- "Quartet of stars inducted to Athletics Australia Hall of Fame". Australian Olympic Committee. 24 October 2014. Retrieved 31 October 2014.
- IAAF World Cup in Athletics - GBR Athletics
- Commonwealth Games Medallists - Athletics (Men) - GBR Athletics
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