Leander Paes: 14 doubles and mixed doubles Grand Slams
He became World No. 1 in the junior tennis ranking way back in 1992. He won the Olympics Bronze Medal in 1996. Since then he has won 8 doubles Grand Slams and 6 in mixed doubles. In all he has 53 doubles titles.
For all his achievements what he got was a Padma Shri like more than 2500 others.