MADRID, Spain --- Seve Ballesteros underwent a third operation for a cancerous brain tumor, a 61/2-hour procedure on Friday that "went better than expected."

Doctors removed the rest of the tumor and reduced brain swelling. The 51-year-old Spanish golf great was in stable condition in the intensive care unit at Madrid's La Paz Hospital.

"The operation went better than expected, and Seve will now be under close observation for 48 hours in the intensive care unit," a hospital spokesman said.

Ballesteros was admitted to the hospital Oct. 6 after briefly losing consciousness at Madrid's international airport. Eight days later, a sizable part of the tumor was taken out.

This operation was one "of great complexity." Doctors wanted to relieve pressure on the brain caused by swelling and bleeding and remove remaining parts of the malignant tumor located in a very deep part of the brain.

"Today, we remember Seve Ballesteros with special affection and concern," Crown Prince Felipe said Friday at an award ceremony in Asturias. "As he himself said, he is playing the game of his life at the moment."

Ballesteros' tumor is an oligoastrocytoma, which affects cells that cover and protect the nerve cells in the brain and spinal cord. In an earlier operation, part of his skull was removed to allow room for the swelling brain to expand.

Ballesteros won the British Open three times and the Masters Tournament twice. He captured a record 50 tournaments on the European tour before retiring last year because of back pain.

After helping Europe to a win in his 1985 Ryder Cup debut, Ballesteros aided the European side as both a player and a captain during Europe's two decades of Ryder Cup dominance.