It was a difficult night for Wayde van Niekerk and Shaun Maswanganyi on the track, but Jo-Ané van Dyk will hope to follow in South African javelin legend Sunette Viljoen-Louw’s footsteps after qualifying for the Olympic final to be held on Saturday in Paris.Viljoen-Louw won the silver medal at Rio de Janeiro in 2016, and still holds the African record of 69.35m.Van Dyk, who is the current African champion, was in imperious form on Wednesday when she launched the javelin into the Parisian sky for a career-best 64.22m to automatically qualify for the final.The 26-year-old’s effort…