Serena Williams is cheerful during a practice session ahead of the Australian Open in Melbourne yesterday. Pic/Getty Image

Melbourne: Serena Williams has vowed to make life difficult for top seed Angelique Kerber and a host of dangerous players out to derail her at the Australian Open, warning she is in Melbourne to win. The American gets her quest for an Open-era record 23rd Grand Slam title underway in a difficult first-round clash against Switzerland's Belinda Bencic in forecast sweltering heat on Tuesday.