Coco Vandeweghe win's over sloane Stephens in Stuttgart 2018

STUTTGART, Germany
Three days ago, CoCo Vandeweghe and Sloane Stephens were Fed Cup teammates who booked a place in November's final for the USA. Today, as opponents in the first round of the Porsche Tennis Grand Prix, the unseeded Vandeweghe mercilessly routed her compatriot 6-1, 6-0 in just 56 minutes