How Frances Tiafoe went from sleeping at a tennis center to the US Open quarterfinals

CNN — After stunning 22-time grand slam champion Rafael Nadal to reach the US Open quarterfinal on Monday, Frances Tiafoe threw his racket on the floor and covered his face in amazement. The 24-year-old simply stood there soaking up the atmosphere created by a raucous Arthur Ashe Stadium. It felt like a seminal moment in the American’s career; a culmination of…