Sania Mirza booked a berth in the women's singles main draw of the Australian Open with an easy straight sets victory over Canada's Stephanie Dubois, in Melbourne today.The 24th seed Sania won 6-2 6-3 in the third and final round of the qualifying competition. Sania had to go through the qualifying route due to low ranking as she has slipped to 145th spot due injuries last season.