MADRID, Spain(AP) Five-time major winner Seve Ballesteros is stable but still undergoing tests to determine why he had a dizzy spell this week.

La Paz University Hospital said it was not known when the 51-year-old golfer might be released. He was taken to the hospital Monday after briefly losing consciousness.

Ballesteros, who has a long history of back pain, retired from competition in 2007. He won the British Open three times and the Masters twice, and had 50 victories on the European tour.