Anna Kiesenhofer: Mathematician, amateur cyclist, Olympic champion
For some reason this story reminded me of the French winning 4x100 freestyle relay in London 2012. They went in as the underdogs but trounced the Americans with Yannick Angel who swam the final leg absolutely trouncing Phelps and co. He was also an athlete who had a hobby of reading and was  quiet a good student at that time. There is something mesmerizing about athletes who also embrace intellectually stimulating activities.