Montgomerie turned professional before the 1988 season and was named the Rookie of the Year on the European Tour that year. He quickly developed into one of Europe's top pros, winning his first event at the 1989 Portuguese Open TPC by 11 shots, and his second, beating a world class field, at the 1991 Scandinavian Masters at Royal Drottningholm Golf Club in Sweden. He made his Ryder Cup debut later in 1991.