Highlights as Alexander Zverev beats Roger Federer to reach the championship match at the Nitto ATP Finals for the first time. Alexander Zverev played for Germany at the Hopman Cup alongside Angelique Kerber but lost in the final to Switzerland. At the Australian Open, he made it to the third round, before being beaten in five sets by world No. 59 Chung Hyeon. At the Rotterdam Open, Zverev was seeded third. However, he was upset in straight sets in the second round by Andreas Seppi. He returned to action at the Abierto Mexicano Telcel, where he reached the semifinals, before losing to eventual champion Juan Martín del Potro in straight sets. He then had a disappointing loss at the first Masters event of the year at the Indian Wells Masters in the second round to João Sousa, despite having break leads in the first and third sets. Zverev then bounced back at the Miami Open when he made his third Masters event final. He faced John Isner in the final, which he lost in three sets, marking his first Masters event final loss. At the beginning of the clay season, he reached the semifinals at the Monte-Carlo Rolex Masters, where he lost to Kei Nishikori in three sets. He then followed it up by reaching the final of his next three events, winning the BMW Open successfully defending his title against Philipp Kohlschreiber, winning his third Masters event title at the Mutua Madrid Open defeating Dominic Thiem and losing in the final of the Italian Open to Rafael Nadal ending Zverev's 13-match winning streak.