Radocano took a “physical and mental” break after reaching the quarter -finals in Miami Open last month, and the opening round in Madrid was on Wednesday on Wednesday her first competitive match since then.
This was the first victory over the outdoor clay for nearly three years.
But on Friday, she is competing in her eighteenth match of competition, forcing the former US champion to return from collapse compared to 3-3 in the first group before she immediately dropped her, he served her again after two dual risks to Costyuk to take the opening match.
Radocano, who continues to work with coach Mark Pitci on an informal basis, improved in the second group, and won four consecutive games on her way to force a decisive group.
But the bad opening match of the British placed Kostyuk for the race to victory and reserved its place in the third round, where Veronica Kodermetova will meet.
Meanwhile, Arena Sapalinka beat Anna Blancova 6-3, but the eighth seeds Cheng Chinen struggled at the defeat of 6-4 6-4 by Anastasia Putabova.
Paul Padosa withdrew from Spain from the championship due to a back injury.
The ninth world number was scheduled to take over the Veronika Kudermetova in the second round.
