Golfer Seve Ballesteros is described as being in a stable condition after an operation to remove a brain tumour.
The operation took place on Tuesday at La Paz hospital in Madrid.
Sports daily Marca reports that the operation lasted 12 hours, but did not say if the tumour was malignant or benign.
A hospital statement issued on Wednesday said Ballesteros, 51, was conscious, in a stable condition and had been transferred to intensive care.
He was taken to the hospital last week after suffering dizziness and a brief loss of consciousness. On Sunday he announced he had a brain tumour.
Ballesteros won the British Open in 1979, 1984 and 1988 and the US Masters twice.