London (CNN) -- South African double-amputee sprinter Oscar Pistorius, who made headlines at the Olympics, set a world record on Saturday in London in defense of the first of his three Paralympic titles. On day three of the Games, he ran 21.30 in men's 200m-T44 title in the first round Saturday evening, easily besting other racers in his heat. The paralympic movement classifies events, using terms like T44, to group competitors based on their disability. His biggest threats in Sunday's gold-medal final will include Brazilian Alan Fonteles Cardoso Oliveira, American sprinter Blake Leeper and South Africa's Arnu Fourie, based on their qualifying times.
@highlight
NEW: South Africa's Oscar Pistorius sets a world record in a 200-meter semifinal heat
@highlight
Several Britons win Paralympic gold, including Richard Whitehead and Sarah Storey
@highlight
China's Yin He sets a world record and wins gold in a cycling event
@highlight
The UK's Ellie Simmonds edges out Team USA's Victoria Arlen in 400-meter freestyle
The win gave Sarah Storey, who was born without a functioning left hand, her second gold of the Games and an impressive 20 @placeholder medals in total across the swimming and cycling disciplines.