Michael Phelps will be aiming for his 20th Olympics gold as he competes in the 200m butterfly category at Rio 2016. Michael Phelps has so far won 19 gold medals in Olympics. Rio de Janeiro: Michael Phelps will set his sights on a record-extending 20th Olympic swimming gold on Tuesday when he tries to wrest back the 200m butterfly title from Chad le Clos. Katie Ledecky will also be battling for another key swimming title on an Olympic day in which...