Simona Halep has now won 14 matches in a row at the Madrid Open after easing to victory over Elise Mertens in the second round.
Caroline Wozniacki was tested by Ashleigh Barty before battling into the Madrid Open third round.
Novak Djokovic looked in fine form as he kicked off his Madrid Open with victory over Kei Nishikori on Monday.
Second seed Caroline Wozniacki was happy to have come through a scare against Ashleigh Barty to keep her Madrid Open quest going.
Caroline Wozniacki fought back from a break down in the deciding set to beat Australian Ashleigh Barty on Monday.
Kei Nishikori could not halt a rejuvenated Novak Djokovic in the first round at the Madrid Open on Monday.
Despite dominating in Monte Carlo and Barcelona, Rafael Nadal insists a repeat in Madrid is not guaranteed.
The top two players on the WTA Tour, Simona Halep and Caroline Wozniacki, were among those to progress at the Madrid Open on Sunday.
Taro Daniel got the better of fellow first-time ATP World Tour finalist Malek Jaziri at the Istanbul Open on Sunday.
After months of uncertainty, Victoria Azarenka says she will play five tournaments in Europe over the coming months.