The 27-year-old Zverev won his opening two singles matches of the season against Brazil's Thiago Monteiro and China's Zheng Zhizhen at the United Cup. He was scheduled to face Alexander Shevchenko of Kazakhstan in Perth in the United Cup quarterfinals but withdrew at the last minute with Kazakhstan leading the tie 1-0 after Elena Rybakina beat Laura Siegemund 6-3, 6-1.