Australian opener David Warner on Tuesday hit his 21st Test century to put Australia in a strong position over England on day one of the fourth Ashes Test in Melbourne. Warner, who scored 103 off 151 balls, reprieved on 99 by a no-ball from Tom Curran, before reaching his century off the next ball. The batsman didn't stay for long at the crease, after his let-off, as he was caught behind off James Anderson. It was his 100th Ashes wicket. The beleaguered tourists all though failed to pick wickets on the first day but Stuart Broad did end his wicket drought after dismissing Usman Khawaja The hosts have already reclaimed the Ashes urn after taking an unassailable 3-0 lead in the five-Test series. They are chasing a 5-0 whitewash over the depleted English side. Skipper Steve Smith too posted an unbeaten half-century. Australia ends Day 1 at 244/3 with Steve Smith (65) and Shaun Marsh (31) at the crease.