Iga Swiatek romped into a showdown with Emma Raducanu in early Australian Open second-round action Thursday ahead of Jannik Sinner stepping up the defence of his Melbourne Park title.Second seed Swiatek raced past world number 49 Rebecca Sramkova 6-0, 6-2 while Britain’s Raducanu reached the Melbourne third round for the first time by beating Amanda Anisimova 6-3, 7-5.