TURIN, Italy—Germany’s Alexander Zverev capped a memorable year by sweeping aside Russian world number two and defending champion Daniil Medvedev 6–4 6–4 to win the ATP Finals on Sunday, claiming the title for the second time in his career. The 24-year-old Zverev, who did not face a single break point in the final, has now won six titles in six finals this year—including Olympic gold in Tokyo and two Masters titles in Madrid and Cincinnati. Zverev, who also beat world number one Novak Djokovic on Saturday, became only the fourth player to beat the top two players in the world in the semis and final of the season-ending tournament. Victory was also sweet revenge for Zverev, who lost in three sets to Medvedev in the round robin stage and came into the match having lost his last five meetings against the Russian. “You keep talking about the perfect match… It …