Tunisia's Ons Jabeur rallied from a set down to knock second seeded defending champion Bianca Andreescu out of the WTA hardcourt tournament in Montreal 6-7 (5/7), 6-4, 6-1 on Thursday.

The third-round upset was twice interrupted by rain as the Birmingham champion Jabeur - first Arab woman to win a WTA title - completed the second defeat of the day for Canada.