MELBOURNE — After twice failing to win her breakthrough major as the No. 1-ranked woman at the Australian Open, Caroline Wozniacki is now expected to drop out of the top 10 after a fourth-round loss to a resurgent Svetlana Kuznetsova on Monday.

Wozniacki had the top ranking for the 2011 and 2012 editions of the season’s first major, but lost in semifinals two years ago and the quarterfinals last year. Her 6-2, 2-6, 7-5 defeat to two-time Grand Slam winner Kuznetsova in the Round of 16 follows back-to-back first-round exits at Wimbledon and the US Open.