Djokovic doubles up, leads Serbia into ATP Cup quarterfinals

Ivan Dodig of Croatia reacts to winning the doubles match against Hubert Hurkacz and Lukasz Kubot of Poland during their ATP Cup tennis doubles match in Sydney, Monday, Jan. 6, 2020. (AP Photo/Steve Christo)
Gael Monfils of France reacts after missing a shot during his match against Novak Djokovic of Serbia at the ATP Cup tennis tournament in Brisbane, Australia, Monday, Jan. 6, 2020. (AP Photo/Tertius Pickard)

Novak Djokovic of Serbia plays a shot during his match against Gael Monfils of France at the ATP Cup tennis tournament Monday in Brisbane, Australia. (AP Photo/Tertius Pickard)

Rafael Nadal of Spain reacts after winning a point against Pablo Cuevas of Uruguay during their match at the ATP Cup in Perth, Australia, Monday, Jan. 6, 2020. (AP Photo/Trevor Collens)
Rafael Nadal of Spain celebrates his win over Pablo Cuevas of Uruguay in their match at the ATP Cup in Perth, Australia, Monday, Jan. 6, 2020. (AP Photo/Trevor Collens)
Novak Djokovic of Serbia reacts after winning a point during his match against Gael Monfils of France at the ATP Cup tennis tournament in Brisbane, Australia, Monday, Jan. 6, 2020. (AP Photo/Tertius Pickard)

BRISBANE, Australia — Novak Djokovic patted the left side of his chest above his heart with his right hand, wished his Serbian supporters a Merry Christmas, and told everyone else listening: “See you in Sydney.”