Serena serves up a title warning

SERENA WILLIAMS has warned her Wimbledon rivals there is more to come after demolishing Jarmila Groth on Court One yesterday.

Last year’s beaten finalist looked at ease as she recorded a routine 6-2 6-1 win over her Australian opponent.

The match lasted less than an hour against an opponent ranked 69th in the world, and second seed Williams was generally happy with her display, but believes she still has a lot left to come.