US Open finalist Alexander Zverev insisted Saturday he is on track to contend for a maiden Grand Slam title despite a mounting personal toll off the court. The world number seven will spearhead Germany in the ATP Cup starting in Melbourne Tuesday as he eyes a first Slam trophy at the subsequent Australian Open. But Zverev, who fell agonisingly short in New York to Dominic Thiem, has endured a tumultuous period including allegations of domestic abuse by a former girlfriend and a recent split with coach David Ferrer. The 23-year-old, however, said he remained buoyed by his strong showing in the majors last year, which included a semi-final finish at the Australian Open. "I worked extremely hard in the off-season," he said. 

"I'd like to think that I did everything I could to be as well-prepared as I can be." Zverev received criticism last year, most notably from outspoken Australian Nick Kyrgios, for flaunting social distancing rules at the ill-fated Adria Tour exhibition tournament organised by world No.1 Novak Djokovic. The German, however, backed the strict measures imposed on players ahead of the Australian season. "I don't think I lost much (fitness)," he said. "Being able to play in front of a crowd, not living in a bubble now during the tournament, I think a lot of players really appreciate that. "We shouldn't really complain too much about the circumstances."