Michael Phelps was targetting a 20th Olympic medal on Thursday while the Games’ badminton match-fixing scandal prompted disgraced Chinese star Yu Yang to announce her shock retirement. Phelps faces a dogfight with US team-mate Ryan Lochte in the 200m individual medley. Lochte will start favourite to win his second individual gold medal of the Games but Phelps wants to win at least one individual title in London. The 27-year-old finished second to Lochte when they met in the semi-finals on Wednesday, and Lochte has the mental advantage of his crushing defeat of Phelps in Sunday’s 400m individual medley. But the pressure is now off Phelps since he overtook the 18-medal haul of Soviet gymnast Larisa Latynina with two medals on Tuesday night, including the relay gold which clinched the Olympic milestone.