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.
WTA rankings on Monday (last week's positions in brackets):
World number one and top seed Serena Williams racked up the 50th title of her 18-year career at the Madrid Open.
Serena Williams went from winning the Madrid Open to losing in the first round at Roland Garros last year.
Serena Williams' tactic of staying in her hotel room and being "boring" appears to be paying off as she won again in Madrid.
Serena Williams was 'bagelled' for the first time in five years in her Madrid Open quarter-final - but won through anyway.
The player field has been announced for the Aegon Classic, staged on grass courts in Birmingham from June 9-16.
A laid-back Serena Williams breezed into the Madrid Open quarter-finals when she barely broke sweat in a 6-3 6-1 destruction of Maria Kirilenko.
Serena Williams made it through to the third round of the Madrid Open with a straight-sets win over Lourdes Dominguez Lino.
The latest WTA rankings, with Maria Kirilenko up to 12th.
Laura Robson claimed arguably the biggest scalp of her career with a 6-3 6-1 hammering of Agnieszka Radwanska in the second round at Madrid.
Second seed Maria Sharapova began her title bid in Madrid with a straight-sets win over Alexandra Dulgheru.
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