Serena Williams can break Margaret Court's record of 24 grand slam singles, according to Martina Navratilova.
Fourth seed Petra Kvitova's stuttering form continued at the Madrid Open but she reached the third round.
Andy Murray's preparations for the French Open gather momentum in Munich.
Danish star powers past American Christina McHale 7-5 6-0 to advance at the Madrid Open.
Spaniard ranked fourth in world and heading in wrong direction as things still not going to plan this season.