Djokovic beats Tsitsipas for 9th straight time at ATP Finals
Serbian tops Greek in his 3rd straight tournament with 6-4, 7-6 (4) victory
Novak Djokovic beat Stefanos Tsitsipas for the ninth straight time by 6-4, 7-6 (4) in the players' opening match at the ATP Finals on Monday.
Djokovic has beaten Tsitsipas in his third straight tournament following wins in Astana, Kazakhstan and at the Paris Masters.
"All the matches we've played have been decided by two or three points and that was again the case tonight," Djokovic said.
He broke Tsitsipas in the opening game and held from there to close out the first set.
"A break in these conditions is decisive," Djokovic said of the fast indoor court.
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A cross-court backhand passing shot winner that landed on the line helped Djokovic move ahead in the second-set tiebreaker.
Tsitsipas won two of his first three career matches against Djokovic but hasn't beaten the 21-time Grand Slam winner in more than three years.
Earlier, Andrey Rublev won a 37-shot rally on his fifth match point to seal a 6-7 (7), 6-3, 7-6 (7) win over fellow Russian Daniil Medvedev in the other Red Group match.
Rublev and Medvedev — along with all Russian and Belarus tennis players — have been competing without their flag or country next to their names as part of widespread sports sanctions due to Russia's war with Ukraine.
Rublev made a similar appeal in February, writing "No war please" on a TV camera lens shortly after Russia's invasion.
His latest appeal comes following Russia's withdrawal from the Ukrainian city of Kherson, one of Ukraine's biggest successes in the nearly nine-month war.
On Sunday, Taylor Fritz beat Rafael Nadal and Casper Ruud defeated Feliz Auger-Aliassime in the Green Group.