A huge blow for Australia ahead of next week's Davis Cup tie against the Czech Republic, with number one ranked-player Nick Kyrgios withdrawing due to a back problem.

Lleyton Hewitt has trained in Melbourne ahead of Australia's Davis Cup tie against the Czech Republic, and received a special surprise.

Aussie duo Nick Kyrgios and Bernard Tomic have both shot up the ATP rankings thanks to their strong performances at the ATP open.

Security at Melbourne's major sporting events is being urgently reviewed after a group of protesters stormed the court during the Australian Open men’s final. Michael Felgate reports.