Roger Federer won the most Grandslam titles winner , born on 8th August, 1981. He is the only person who won 18 major single titles in the world. Grand slam singles won in
Australian open in the years: 2004, 2006,2007, 2010, 2017
In French opens: 2009
In Wimbledon: 2003, 2004, 2005, 2006, 2007, 2009, 2012
In US opens : 2004, 2005, 2006, 2007, 2008