GOT IT COVERED: No.3 seed Stan Wawrinka fought past Ukrainian Illya Marchenko to reach the quarterfinals; Getty Images
Check out the best photos from day eight action at the US Open…
GOT IT COVERED: No.3 seed Stan Wawrinka fought past Ukrainian Illya Marchenko to reach the quarterfinals; Getty Images
INTENSE: Romanian Simona Halep fires a forehand in her impressive win over Carla Suarez Navarro; Getty Images
STRETCHED: Spaniard Carla Suarez Navarro was on the run in her fourth round meeting with in-form Simona Halep; Getty Images
RESPECT: Juan Martin del Potro consoles No.8 seed Dominic Thiem after a knee injury forced him to retire from their fourth round clash; Getty Images
POWERFUL: Venus Williams fires a backhand in a high-quality meeting against Czech Karolina Pliskova; Getty Images
BIG WIN: No.10 seed Karolina Pliskova celebrates reaching her first Grand Slam quarterfinal with a tense three-set win over Venus Williams; Getty Images
EYE ON THE PRIZE: Japan’s Kei Nishikori was in impressive form on day eight, sweeping aside the dangerous Ivo Karlovic in the fourth round; Getty Images
UNDER PRESSURE: 37-year-old Croatian Ivo Karlovic’s hope of victory in his first US Open fourth round were dashed by a firing Kei Nishikori; Getty Images
RECORD WIN: Serena Williams’ fourth round win was her 308th career Grand Slam singles win, an all-time record; Getty Images
NO MATCH: Yaroslava Shvedova reaches for a backhand in her straight-set loss to top seed Serena Williams; Getty Images
FIRED UP: Brit Andy Murray shows his excitement at making the quarterfinals after a demolition of Grigor Dimitrov; Getty Images
NIGHT TO FORGET: Bulgarian No.22 seed Grigor Dimitrov could only manage five games in his fourth round battle with No.2 seed Andy Murray; Getty Images
ELIMINATED: World No.4 Agnieszka Radwanska is out of the tournament, beaten by rising star Ana Konjuh; Getty Images
BREAKTHROUGH: 18-year-old Croatian Ana Konjuh is into her first Grand Slam quarterfinal; Getty Images
