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Australian tennis player Nick Kyrgios has hit out at world number one Novak Djokovic, criticizing him again for holding the ill-fated Adria Tour which led to a spate of Covid-19 cases.

The 17-time Grand Slam winner, who is currently taking part in the Cincinnati Open in New York as part of the preparation for the US Open, took yet another victory on Tuesday beating American Tennys Sandgren in two straight sets 6-2, 6-4 and extending his winning streak to a whopping 20-0 record.

READ MORE: ‘I am not afraid’: Novak Djokovic dismisses health concerns ahead of US Open as he pursues Roger Federer’s Grand Slam record

Kyrgios’ remarks came after Djokovic was asked about the possibility of remaining unbeaten through the entire 2020 season.

Hell of a tennis player. May go unbeaten in 2020, can’t take that away from him. Unfortunately when he was supposed to show some leadership and humility he went missing. Majority would say he has taken an L regardless,” Kyrgios wrote on his Twitter page.

Hell of a tennis player. May go unbeaten in 2020, can’t take that away from him. Unfortunately when he was supposed to show some leadership and humility he went missing. Majority would say he has taken an L regardless. https://t.co/UjZ9LbHTj3

In June, Djokovic organized an exhibition tennis tour in Serbia and Croatia which resulted in several positive Covid-19 tests among the participants, including the Serbian tennis star himself.

Djokovic, Grigor Dimitrov, Borna Coric and Viktor Troicki all tested positive, raising the issue of neglecting precautionary safety measures during the Adria Tour.The tennis star later apologized stressing that the tournament was organized with best intentions, however, it didn’t save him from the backlash with Kyrgios being among his most vocal critics.

Djokovic who will play at Flushing Meadows next week is widely considered the main favorite to clinch the US Open title, after his main rivals Rafael Nadal and Roger Federer withdrew from the tournament.