Ion Țiriac
You're not alone in thinking Federer should be at the top of this list. In this case, Federer has to settle for second place, as former Romanian professional and businessman Ion Țiriac is the richest tennis player of all time.
Originally from Transylvania, Țiriac began his professional sports career with Romania's national ice hockey team before moving to tennis in 1968. He won the 1970 French Open men's doubles with compatriot Ilie Năstase and went on to win the Davis Cup on several occasions. Despite never winning a Grand Slam singles title, Țiriac had a career-best ranking of No. 8 and amassed 22 career titles during his career.
Following his tennis career, Țiriac moved into business, where he has become one of the wealthiest athletes in history. Țiriac is the wealthiest tennis player of all time, with a diverse business portfolio that includes retail, insurance, auto leasing, and airlines.
Career Span: 1968 – 1979
Net Worth: US $1.6 billion