Three Things We Can Learn From Serena’s U.S. Open Loss
Serena Williams’ semifinal loss to Roberta Vinci at the 2015 U.S. Open has been called "the greatest upset in tennis history." Indeed, who could have predicted that Serena's dominance of Grand Slams would be derailed by a player ranked 43rd in the world. With the omniscience of time, perhaps this grand upset makes a little…

