Ma Long : `Sport played`: Table tennisTable tennis : `Olympic game contested`: The London 2012 Summer OlympicsThe London 2012 Summer Olympics : `~Olympics participated in`: United States of America
[Human]: Do you know Ma Long? [Assistant]: Yes! He is a good Table Tennis player. What do you think of him? [Human]: I have never hear of him. Was he is in the olympics in London?  
Yes, he was in the 2012 Olympics. He competed against LeBron James for the gold medal!