Jannik Sinner beats Alexander Zverev in 3 sets for his second Australian Open title in a row

MELBOURNE, Australia — There’s all sorts of ways beyond merely the score to measure just how dominant Jannik Sinner was while outplaying and frustrating Alexander Zverev during the 6-3, 7-6 (4), 6-3 victory Sunday that earned the 23-year-old Italian a…