by Jim Slater Agence France-Presse NEW YORK, United States (AFP) — When CoCo Vandeweghe says she’s trying to become the best athlete in her family as well as a US Open champion, it’s more impressive company than one might imagine. There’s her Olympic swimmer mother Tauna, the NBA trio of her uncle Kiki, grandpa Ernie and great-uncle Mel plus ex-beach volleyball pro uncle Bruk and aunt Heather, the US polo team captain. “My grandfather always said he was the […]