NEW YORK: Naomi Osaka became the first Japanese to win a Grand Slam singles title on Saturday as her idol Serena Williams angrily imploded, calling the chair umpire in the US Open final “a thief”.Osaka, 20, triumphed 6-2, 6-4 in the match marred by Williams’s second set outburst, the American enraged by umpire Carlos Ramos’s warning for receiving coaching from her box.When a second code violation for racquet abuse was handed out to her — along with a point penalty — Williams...