MELBOURNE, Australia (AP) — If Sebastian Korda wasn't already nervous enough playing at the Australian Open, one of his first impressions of Rod Laver Arena was seeing the giant sign in the Walk of Champions bearing the name of his father, Petr Korda, and the year he won the title in 1998. No pressure or anything. On Sunday, the younger Korda got his own debut Australian Open off to a promising start, winning his opening matches in both the boys' singles and doubles events.