Jannik Sinner said he was confident and relaxed after reinforcing his Australian Open title credentials with a straight-sets mauling of 26th-seed Sebastian Baez Friday. Sinner, the 22-year-old Italian fourth seed, was in a different class from the Argentine, spending just one hour and 52 minutes on court for the 6-0, 6-1, 6-3 romp. It set
