Britain's Jack Draper let slip a third-set lead to fall just short of an upset against world number eight Andrey Rublev in the Madrid Open second round.
World number 121 Draper was 3-0 up in the third set but lost 2-6 6-4 7-5.
Draper, 20, has won four titles on the second-tier Challenger circuit this year - all on hard courts - and brought his momentum onto the clay at this prestigious Masters 1000 event.
But it was not quite enough against Rublev, who could face Dan Evans next.
Left-hander Draper had been impressive in his opening match against Italian world number 27 Lorenzo Sonego on Sunday and against the even higher ranked Rublev he stayed composed when he was taken to a third set.