Birmingham: World No. 1 Naomi Osaka succumbed to a straight sets defeat to Yulia Putintseva at the Birmingham Classic yesterday, handing Ashleigh Barty the chance to end the week on top of the rankings.

Osaka admitted ahead of her first grass court tournament of the season that she is still not at home on the surface and it showed as Putintseva romped to a 6-2, 6-3 win.