5. Andre Agassi
Believe it or not, this man was once described as a rock star of the tennis scene back in the day. He went on to win eight grand slam titles and even participated in the Olympics
Want to know the craziest part? He was runner up in seven other grand slam championships, which makes him one of the most consistent players of all time! Beyond that, he ended up winning the career Golden slam award and The ATP Tour world championships, giving him the distinction of the only player in history to achieve what is dubbed the career super slam award.