World number three Dominic Thiem said on Monday tennis players "must learn" from the ill-fated Adria Tour and described Nick Kyrgios' criticism of those who took part as "unnecessary". Thiem played in the Belgrade leg of last month's ill-fated tournament organised by world number one Novak Djokovic. "We have to learn from the mistakes and be careful nowadays with this pandemic we are facing. That's what we have to take from the Adria Tour," Thiem told reporters at an exhibition tournament in Berlin. Djokovic, Grigor Dimitrov, Borna Coric and Viktor Troicki all then tested positive for COVID-19. Djokovic later apologised for the event where players embraced across the net and later partied together at a nightclub.

Thiem tested negative for the virus but like all those involved faced fierce criticism and has already apologised. "Novak and the others didn't commit any crimes, you have to make that point," Thiem added. "The fact we were criticised is not unfair because we all made mistakes. That's clear. "But it was way too much at the end, because the whole tournament was well intended." Kyrgios has been highly critical of anyone who played in the Adria Tour, which he branded a "boneheaded decision" to hold with such little regard for hygiene. The out-spoken Australian then branded Alexander Zverev "selfish" for partying despite promising to self-isolate following a negative test after playing on the Adria Tour. Thiem and Kyrgios traded insults last week on social media over Zverev's behaviour. Kyrgios and Zverev have pulled out of the Berlin event, which started on Monday amid strict hygiene guidelines with organisers promising "there will be no player parties here". Zverev said he skipped Berlin to train more, while Kyrgios pulled out amid travel concerns from Australia where the pandemic has worsened with Melbourne back in lockdown.