Australian Open: Rafael Nadal allays fears over a back problem, Daniil Medvedev and Andrey Rublev both win

Rafael Nadal showed no signs of his bad back in his win over Laslo Djere in the first round at the Australian Open as teenager Carlos Alcaraz was impressive in his highly-anticipated Grand Slam debut match; Russia's ATP Cup stars Daniil Medvedev and Andrey Rublev both cruised through