#2 Boris Becker

One of the undoubted global superstars of tennis in the late 1980s and early 1990s, Becker won his first of his six Grand Slams at the tender age of 17, and went on to write his name in gold in the annals of Tennis history.
He was ranked number one during his playing days, winning a total of 44 titles, playing out a notable rivalry with Stefan Edberg.
He played his part in molding another all-time great when he served as coach to Novak Djokovic for six of the Serbian's 15 Grand Slam titles.
However, if things had panned out differently, Becker might have made a name for himself as a footballer rather than a Tennis star.
He was reportedly offered a trial at his native club Bayern Munich which he turned down, instead sticking with his Tennis. He however says Bayern Munich remains his number one passion, and served on the club's board of directors for many years.