Seve Ballesteros, one of golf's greatest and most charismatic players, died on Saturday at the age of 54 following a long battle with cancer, his family said.
The Spaniard, a five-times major winner, had been recuperating at his home in northern Spain after four operations on a brain tumour diagnosed in late 2008, followed by a course of chemotherapy.
"Today, at 2.10 a.m. Spanish time, Seve Ballesteros passed away peacefully surrounded by his family at his home in Pedrena," the family said in a statement on the player's personal website.
Regarded by many as golf's greatest shot-maker, Ballesteros won 87 titles worldwide, 50 of them on the European Tour.
"Seve made European golf what it is today," Westwood added. "RIP Seve."
A winner of three British Opens and two Masters titles, Ballesteros also helped revive Europe's fortunes in the Ryder Cup, breathing new life into the team competition against the United States.
"He was a game-changer," fellow Spaniard Sergio Garcia said. "To come from where he did and do what he did was amazing."
European Tour chief executive George O'Grady said the inspirational Ballesteros would leave a powerful legacy.
"Seve's unique legacy must be the inspiration he has given to so many to watch, support, and play golf, and finally to fight a cruel illness with equal flair, passion, and fierce determination," O'Grady said in a statement.
"We have all been so blessed to live in his era. He was the inspiration behind the European Tour."
The tumour, the size of two golf balls, was discovered after Ballesteros collapsed at Madrid airport and was rushed to a nearby hospital.
The final cause of death was respiratory problems, Saturday's statement added.