Australian Open 2021 day four: Tsitsipas v Kokkinakis, Barty makes hard work of progress – live!

• Updates from the day session of the tennis at Melbourne Park
• Kyrgios finally gets Australian Open party started
• Any thoughts? Email or tweet @mike_hytner

4.27am GMT

First set: Stefanos Tsitsipas* 4-3 Thanasi Kokkinakis (denotes server) Tsitsipas is called for another time violation as he readies himself to serve this game. It might be coincidence, but Kokkinakis then brings up break point. He fails to take it but he brings up another one after forcing an error from the Greek with a ball that kicks high again. Tsitsipas responds with class though, drawing Kokkinakis across before moving the net and finishing off with a simple volley. And the fifth seed makes no more errors as he moves into a 4-3 lead.

Meanwhile, there's been a big upset in the women's draw over on Margaret Court Arena.... defending champion Sofia Kenin is out of the Australian Open after falling in straight sets to Kaia Kanepi of Estonia, 6-3, 6-2.

4.20am GMT

First set: Stefanos Tsitsipas 3-3 Thanasi Kokkinakis* (denotes server) High quality stuff from both players at 15-15 before Kokkinakis unfurls a lovely backhand winner down the line that draws oohs from the crowd inside Rod Laver Arena. And the Australian builds on that as he serves out the game to draw level once more.