Ivan Lendl is a Czech–American former professional tennis player and coach. Widely regarded as one of the greatest tennis players of all time, he was ranked as the world No. 1 in men's singles by the Association of Tennis Professionals (ATP) for 270 weeks, and finished as the year-end No. 1 four times. Lendl won 94 career singles titles, including eight majors and seven year-end championships. He was runner-up at a further eleven majors, for a total of 19 major finals. ATP world No. 1 from January 30, 1989 to August 12, 1990 — 80 weeks. Wiki link