sentences:  In 1970, he won the John Player Classic, at that time its £25,000 first prize was the richest offered in golf (in those days, even the British Open champion received just a little over £5,000), it made him that season's leading money-winner, although not Order of Merit leader, which was decided by a points system not directly related to prize money.Later in his career, O'Connor became the leading "senior" (over-50s) professional player of his day, just before the lucrative U.S.-based Senior PGA Tour, now known as the PGA Tour Champions, took off.He won the PGA Seniors Championship six times and the World Senior Championship in 1976 and 1977.