Which of the following has a twin brother who plays doubles together: Gigi Fernández or Mike Bryan?
Gigi Fernández: Beatriz "Gigi" Fernández (born February 22, 1964) is a former professional tennis player. Mike Bryan:  With his twin brother Bob, he has been world No. 1 doubles player for much of the last several years, first achieving top ranking in September 2003, and they became the second men's doubles team to complete the career golden slam by winning the 2012 Summer Olympics.
i don't know