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 Australian Rugby League for the Balmain Tigers, scoring 11 tries, and also competed in the World Sevens Tournament. He returned to the track in 1992 and was selected for the Barcelona Olympic team but was forced to withdraw due to an Achilles tendon injury.
|1984||Olympic Games||Los Angeles, United States||4th||400 m|
|4th||4x400 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||4x400 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.
- "Darren Clark". Sport Australia Hall of Fame. Retrieved 10 September 2013.
- IAAF World Cup in Athletics - GBR Athletics
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