By Fatih Erel
ISTANBUL (AA) - Defending champion Novak Djokovic pulled out from US Open due of injury during fourth-round match against Swiss Stan Wawrinka.
After having shoulder problem in the third set, the world number one Djokovic retired to send the Swiss on to the quarterfinals, 6-4, 7-5, 2-1 (ret.)
Three-time Grand Slam champion Wawrinka will play Russian fifth seed Daniil Medvedev in the quarter-finals.
"Sorry he had to retire to finish the game like that, but for me, most important is the way I am playing, the way I am moving. Tonight I think was really high-level," Wawrinka said after the match.