CNN  —  Coco Gauff broke down in tears just after her straight sets defeat in the fourth spherical of the Australian Open up on Sunday, although fellow American Jessica Pegula progressed to the quarterfinals. The 18-year-previous Gauff shed 7-5 6-3 to Latvian Jelena Ostapenko on Margaret Court docket Arena and could not disguise her disappointment when talking to reporters about the match later on. Requested to demonstrate her frustrations, a tearful Gauff explained: “I consider it’s mainly because I worked definitely tough and I felt genuinely excellent coming into the event and I however feel good. I continue to really feel like I’ve improved a whole lot. “But when you…