Japanese star Naomi Osaka will reclaim the WTA World No. 1 spot for the second time in her career when the new rankings are made official next Monday. At the ongoing Rogers Cup WTA tournament, reigning World No. 1 Ashleigh Barty suffered an opening round stunner to American player Sofia Kenin, opening the door for former No. 1s Osaka and Karolina Pliskova of the Czech Republic to return to the top.In an earlier quarterfinal match on Friday, Pliskova lost to Canadian star Bianca Andreescu 6-0, 2-6, 6-4.