Nigeria’s Tobi Amusan won her third consecutive Diamond League title after coming out tops in the women’s 100m hurdles at the Prefontaine Classic, Hayward Field, USA. Amusan beat a strong field over the final hurdles, posting in a season-best 12.33. Jasmine Camacho-Quinn of Puerto Rico was second in 12.38 and Keni Harrison of the USA was third in 12.44. World champion Danielle Williams of Jamaica…