At this stage of the January game, the Aussie Open tennis grand slam is usually a place of easy enjoyment as we watch the world’s best battle it out on the court. But last night’s match between Russian Daniil Medvedev and Aussie crowd-stirrer Nick Kyrgios (which the former won) has again focused on some of the crowd’s behaviour. The Cristiano Ronaldo-inspired ‘siu’ chant was let rip between serves and on double-faults, a development Medvedev said was “just disappointing”. “It is not everybody who is doing it, but those who are doing it probably have a low IQ,” he said. The Herald Sun this morning says the chant has “spread like Omicron across Melbourne Park crowds this week”, and many on the court and watching from home have mistaken it for a boo. Someone who was booed yesterday: tournament organiser Craig Tiley. The Tennis Australia official is under fire for the Novak Djokovic saga – and now over players’ COVID testing (or lack thereof). Yesterday Tiley said he would not be resigning.