Kerber concentrating on reboot

Angelique Kerber said on Sunday that reviving her flagging fortunes on tour is her main priority rather than reclaiming the world No 1 ranking from Serena Williams at the Dubai Tennis Championships.

Germany's two-time Grand Slam champion took over top spot last September when she won the US Open, but she promptly relinquished the crown in Melbourne last month after Williams won the Australian Open, reclaiming her long-held No 1 ranking in the process.

Now Kerber, who was bounced in the fourth round in Melbourne by Coco Vandeweghe of the US, is determined to prove she can still pose a threat on a regular basis.