KATIE BOULTER is confident her grand slam breakthrough will come despite another disappointing second-round loss.

The 28-year-old has now completed a year of being seeded at the major tournaments but has only three wins to show for it, with her four defeats coming against players with a combined ranking of 388.

The latest came on a chilly Court 3 at the Australian Open, where Boulter turned around her match against Russian world number 75 Veronika Kudermetova only to fall to a 7-6 (3) 2-6 6-2 defeat.