No. Lleyton has appeared in two Olympics. He finished 33rd in men's singles tennis at the 2000 Summer Games in Sydney. At the 2008 Summer Games in Beijing, he finished 17th in men's singles tennis and 5th in men's doubles tennis with partner Chris Guccione.
At the 2012 Summer Olympics in London, Jessica Ennis(Great Britain) won the gold medal in the Women's heptathlon.
I believe the London games was the first medal. Gold for the marathon.
OneAfghanistan won one bronze medal during the London 2012 Olympics.
one a gold medal for the Heptathlon at the London 2012 Olympics