Wimbledon and Olympic champions Nikola Mektic and Mate Pavic complained about the crowd noise in the Kia Arena after they lost 7-6 6-3.
TV footage showed Aussies Kyrgios and Kokkinakis having an animated exchange with the Croatian pair and their entourage in a players area at Melbourne Park.
Kokkinakis tweeted: "That was crazy man, thought it was UFC".
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