O’Connor turns professional in 1967. The PGA European Tour officially begins in 1972, and O’Connor makes the top hundred on the Order of Merit in each of its first twenty-one seasons, with a best ranking of seventh in 1975. He wins four European Tour events. As a senior he competes on both the European Senior Tour and the United States based Champions Tour, and wins two Senior British Open titles (before it becomes one of the senior majors) and two Champions Tour events.
In 1992 O’Connor wins the Dunhill British Masters at the Woburn Golf Club, his fourth and final European Tour victory, with scores of 71, 67, 66, 66. A weather-interrupted tournament means that 36 holes have to be played on Sunday. At 44 years, O’Connor is the oldest player in the field.
O’Connor plays in the Ryder Cup twice. In 1975 he is a member of a losing Great Britain & Ireland team and in 1989 he is part of a European team which ties the match to retain the trophy. His personal record is one win, three losses and no ties. His win over Fred Couples is best remembered for a stunning 2 iron shot on the last hole at The Belfry which he leaves just 4 feet from the hole.
O’Connor is also active in golf course design, being involved in the design of at least 18 courses in Ireland, and many more abroad.
Christy O’Connor Jnr dies while on holiday with his wife Ann on January 6, 2016 in Tenerife, Canary Islands.