by Erin Wright As the tennis world comes to grips by the revelation that one of its luminaries failed a drug test, Rafael Nadal and others look on with unease.
Novak Djokovic vanquished Andy Murray for the fourth time in an Australian Open final on Sunday to win a record-equalling sixth title and serve notice to his rivals that he could surpass even his stellar 2015 this year.
Britain have two Grand Slam singles semi-finalists for the first time since 1977 after victories for Johanna Konta and Andy Murray at the Australian Open.
Secret files exposing evidence of widespread suspected match-fixing at the top level of world tennis, including at Wimbledon, revealed by the BBC and Buzzfeed.
World number one Serena Williams was ruled out of her opening match at the Hopman Cup mixed team event in Perth on Monday because of inflammation of the knee.