Roger Federer, 37, has earned more than $120million in prize money - but his success may not be all down to him. Tennis expert and journalist Thomas Sotto has claimed that Federer owes half of his success to Mirka Federer - his wife. Mirka, a former professional tennis player, married her fellow Swiss in 2009."Mansour Bahrami [a former pro tennis player] said that half of Roger's success is thank to Mirka,” Sotto said. “I agree with him.