A MORNINGTON tennis player has made the most of a devastating situation. Riley Dumsday, 12, was diagnosed with a rare childhood condition called Perthes’ disease in 2011, which has made him unable to put pressure on his right leg and forced him to use a wheelchair. But Dumsday hasn’t let the condition hold him back and returned home with two trophies from the Queensland Wheelchair Tennis Open on 28 June. He took out the under-18 doubles with partner Marcus Lentini and finished runner-up in boys under-18s singles. Riley’s father, Steve Dumsday, said Riley had come a long way since starting…