Doha - Sofia Kenin suffered her third defeat since winning the Australian Open earlier this month, losing to Ukrainian youngster Dayana Yastremska in the Doha second round, while world number one Ashleigh Barty cruised to victory on Tuesday.

American world number five Kenin, who defeated Garbine Muguruza to claim her maiden Grand Slam singles title in Melbourne, went down 6-3, 7-6 (7/4) to Yastremska.