Serena Williams stretched her lead over Maria Sharapova at the top of the WTA rankings after her victory in the Italian Open.
Maria Sharapova withdrew from her Italian Open quarter-final with Italy's Sara Errani because of "physical problems".
Serena Williams tied her longest career winning streak with a 6-0 6-1 Rome Masters rout of Dominika Cibulkova.
Maria Sharapova eased into the third round of the Italian Open with a 6-2 6-2 win over Garbine Muguruza Blanco.
Britain’s Laura Robson secured her place in the second round of WTA Rome with a 6-3 6-2 victory over Venus Williams.
WTA rankings on Monday (last week's positions in brackets):
The latest WTA rankings, with Maria Kirilenko up to 12th.
Second seed Maria Sharapova began her title bid in Madrid with a straight-sets win over Alexandra Dulgheru.
The latest WTA rankings, with Ana Ivanovic moving up one place.
The latest WTA rankings, with Maria Kirilenko dropping one spot.
The latest WTA rankings, with Anastasia Pavlyuchenkova jumping six places into the top 20 after winning the Monterrey Open.
Caroline Wozniacki received a walkover into the quarter-finals of the WTA Charleston event after Andrea Petkovic withdrew.
Laura Robson called herself a "double muppet" on court as she crashed out of the WTA Charleston event to Eugenie Bouchard.
The latest WTA rankings, with Caroline Wozniacki dropping down a place.
WTA rankings on Monday.
Tennis
US Open
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