Björn Rune Borg
He is a former world No. 1 tennis player from Sweden widely considered to be one of the greatest in tennis history. Between 1974 and 1981 he became the first male professional to win 11 Grand Slam open era singles titles: six at the French Open and five consecutive at Wimbledon. He also won three year-end championships and 15 Grand Prix Super Series titles.
Borg reached four finals in six years from 1976 through 1981 but lost all of them.