World number one Novak Djokovic beat Russia’s Daniil Medvedev in straight sets to win his ninth Australian Open title and extend his record-breaking reign at Melbourne Park Sunday.Djokovic demolished the fourth seed 7-5, 6-2, 6-2 in front of 7,400 fans on Rod Laver Arena to end the Russian’s unbeaten run at 20 matches.In winning his third straight Australian Open, the Serb claimed his 18th Grand Slam title to move within two of Roger Federer and Rafael Nadal who have 20 each, while denying Medvedev his first. 
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