Controversial Australian star Nick Kyrgios believes his Grand Slam comeback has come at the right time because tennis has become "a bit mundane".

The recent training sessions on the Melbourne courts should have cleared up any doubts and, in the Happy Slam media day, the 29-year-old Australian revealed how he feels, after wrist problems and a pulled abdominal muscle.

Mats Wilander believes Nick Kyrgios has the capability of causing a 'big upset' in the Australian Open, but has raised concerns about the Aussie star's fitness. Kyrgios' first-round match against Jacob Fearnley next week will be his first match in a major tournament in over two years.