Conversation so far:
What happened in 2012?
He entered the T44 classification men's 100 metres, 200 metres and 400 metres races, and the T42-T46 4 x 100 metres relay.
did he win any of them?
In the 200-metre competition, Pistorius established a new T43 world record of 21.30 seconds in his heat on 1 September, but he was defeated in the final.

Question: who defeated him in the final?
Self-contained rewrite: who defeated Oscar Pistorius in the final at the 2012 Summer Paralympics?