British number one Johanna Konta beat 16th seed Magdalena Rybarikova 6-3 7-5 in the first round of the Madrid Open.
World number 23, unseeded in the Spanish capital, beat Slovakia's Rybarikova in an hour and 59 minutes.
Simona Halep and Caroline Wozniacki - the top two players in the world rankings - secured comfortable wins.
World number one Halep, who has won this event in each of the past two years, needed only 51 minutes to beat Russia's Ekaterina Makarova 6-1 6-0.