London: World number one player Novak Djokovic of Serbia defeated former champion Alexander Zverev of Germany 6-3, 7-6 (4) in consecutive sets on Friday for the ninth time in the last tournament of the year ATP World Tour Finals in Group Tokyo 1970 Has made it to the semi-finals. Djokovic is playing in this tournament for the 13th time and reached the semi-finals for the ninth time. Top seed Djokovic remains two wins away from the tournament, equaling a record sixth title. The Serbian player has avenged the defeat of Zverev in the final of this tournament in 2018. The world number one will face Austria’s Dominic Thiem in the semi-finals against whom he lost in a group match last year. Djokovic is already sure to finish the year for the sixth time as number one. Djokovic has a career record of 7-4 against world number three Thiem. The last five matches between the two have either gone into the tie-break or they have been decided in the decisive set. In another match of Group Tokyo 1970, Russia’s Denil Medvedev defeated Argentina’s Diego Schwartzman 6-3, 6-3 in successive sets. Medvedev will face world number two player Rafael Nadal of Spain in the semi-finals. Medvedev has never been able to beat Nadal in three career bouts. For the 16th consecutive time, the winner of 20 Grand Salem titles playing in this tournament, Nadal has not won this title even once in his illustrious career.