Danielle Collins ends year of pain by reaching Australian Open quarter-final

American defeated Elise Mertens 4-6, 6-4, 6-4 in three hours Collins underwent emergency surgery to treat endometriosis Nearly a year ago, in the heat of another Australian summer, Danielle Collins was reduced to a level of pain that she would not wish on another soul. By the third set of her match against Daria Kasatkina in the Philip Island Trophy, an event held at Melbourne Park during the second week of the Australian Open, she fell to the ground while severely cramping in her abdominal musc...