US Open PHOTOS: Ivanovic stunned by Czech; Serena Djokovic sail through

Image: Ana Ivanovic of Serbia returns a shot to Karolina Pliskova of the Czech Republic during their US Open women's singles second round match at the USTA Billie Jean King National Tennis Center......

Tennis round-up: Kristyna stuns twin Karolina

IMAGE: Czech Republic's Pliskova twins, Kristyna and Karolina Pliskova embrace at the net after their second round match at the WTA Premier Nature Valley Classic at Edgbaston Priory Club,......

Tennis round-up: Kristyna stuns twin Karolina

IMAGE: Czech Republic's Pliskova twins, Kristyna and Karolina Pliskova embrace at the net after their second round match at the WTA Premier Nature Valley Classic at Edgbaston Priory Club,......

Tennis: Rogers stuns Serena at Top Seed Open

IMAGE: Shelby Rogers plays a forehand during her match against Serena Williams during Top Seed Open at the Top Seed Tennis Club in Lexington on Friday. Photograph: Dylan Buell/Getty Images Shelby......

Bardy ends Gauff's run; Bencic withdraws from US Open

Brady defeats Gauff in straight sets to reach first WTA final IMAGE: Jennifer Brady plays a forehand. Photograph: Dylan Buell/Getty Images American Jennifer Brady defeated compatriot Coco......

PIX: Ostapenko stuns Pliskova; Easy for Djokovic, Tsitsipas

Images from Day 5 of the French Open, at Roland Garros, in Paris. IMAGE: Latvia's Jelena Ostapenko hit 27 winners during her second round match against the Czech Republic's Karolina Pliskova.......