American Madison Keys relied on her big serve on key points to outclass 2020 Australian Open champion Sofia Kenin 7-6 (2), 7-5 on John Cain Arena on Monday and reach the second round of the year’s first Grand Slam. Former US Open runner-up Keys, who won her first trophy since 2019 at the Adelaide International 2 warm-up event last week, struggled to gain the upper hand in the contest before sealing the opening set in a tiebreak with her eighth ace.