Pistorius made history when he competed at the 2011 World Athletics Championships in Daegu, reaching the 400m semifinals and then helping South Africa reach the final of the relay.

CNN: STORY HIGHLIGHTS

South Africa are among the favorites to land the 4x400m title after finishing second in last year's world championships in Daegu in the event.

CNN: August 9, 2012 -- Updated 1616 GMT (0016 HKT)

The four-time Paralympic Games gold medalist won a silver medal as part of South Africa's 4x400-meter relay at the world championships in Daegu, South Korea, last year.

CNN: 'Blade runner' makes unprecedented Olympic debut

Ukhov will now look to take his indoor supremacy outdoors and challenge the likes of compatriot Alexandr Shustov at a number of Diamond League meetings and ultimately at the World Championships in Daegu, South Korea in August.

BBC: Ivan Ukhov retains European Indoor high jump title

His new personal best time, 0.41 seconds better than his previous fastest, could also allow him to compete in the World Athletics Championships, which take place in Daegu, South Korea later this year.

CNN: Blade runner Pistorius makes 400m Olympic qualifying time

Ennis broke through at the 2009 World Championships when she claimed gold in Berlin but last year in Daegu, South Korea, she relinquished her title to Russia's Tatyana Chernova.

CNN: STORY HIGHLIGHTS

For Blake, who recorded the year's leading time over 200m and a personal best in Friday's 100m, it marks another significant step in his rise to prominence after clinching World Championship 100m gold in Daegu, South Korea last year, after Bolt was disqualified from the final after a false start.

CNN: Lightning strikes twice as Blake beats Bolt again

American Christian Taylor won the men's triple jump with a 17.81 meters effort to add to his world title from Daegu last year.

CNN: Bolt makes history with 200m triumph at London Olympics