American world number 14 Madison Keys has also withdrawn due to illness
Tennis
Abu Dhabi
Abu Dhabi awaits Djokovic return after 6-month layoff
Former world number one to face Roberto Bautista Agut at Mubadala world championships on Friday
Abu Dhabi
Djokovic targets Abu Dhabi return after long injury lay-off
Former world No 1 is due to make his competitive return in the UAE after six months out
Rafael Nadal
Video: Nadal wins 3rd US Open and 16th Grand Slam
Spaniard Rafael Nadal beats South Africa’s Kevin Anderson to win his third US Open.