The British No 1 does not have a standout weapon in his game but he is known for his impressive physical endurance and tremendous mental approach. His heavy topspin forehand, which contrasts with his very flat two-handed backhand, has become a real weapon and with each victory Norrie's confidence at the crunch moments of matches has grown. From one of the league's top pass rushers to another, Pittsburgh Steelers outside linebacker T.J. Watt is expected to miss some time after sustaining knee and hip injuries in Sunday's tie with the Detroit Lions. Please use Chrome browser for a more accessible video player The 24-year-old German will face Green Group winner Djokovic for the fifth time this year, having lost on three occasions including in the last four of the US Open, but having beaten the Serb in the semi-finals of the Tokyo Olympics.