Margaret Court with 62 Grand Slam titles from 24 Grand singles titles, 19 Grand Slam women's doubles titles, and 19 Grand Slam mixed doubles titles.
6 total
Steffi Graf won four Australian Open titles, five U.S. Open titles, six French Open titles, and seven Wimbledon titles for a total of 22* grand slam titles. * It should be noted that Margaret Court Smith holds the record for Grand Slam victories with 24 wins
Don Budge has won 6 Grand Slam Singles Titles.
keanu and Dominic
Roger Federer currently holds the grand slam record. He has won 16 grand slam titles and is still very much active on the ATP World Tour
14 grand slam singles
Louise Brough Clapp & Margaret Osborne duPont, and Martina Navratilova & Pam Shriver, all from the USA, have 20 women's doubles Grand Slam titles each.
As of January 2017, Serena Williams has won 23 Grand Slam singles titles and 14 Grand Slam doubles titles. She has earned 67 overall career titles. On January 28, 2017, Williams passed Steffi Graf for the most women's Grand Slam titles (23) in the Open Era. Margaret Smith Court won 24 titles, most of them at a time when only amateurs could play in events.
Roger Federer won more than 10 grand slam titles
Federer. He has 17 GS titles as of his 2012 Wimbledon, which is his 7th Wimbledon title.
Margaret [nee Smith] Court holds the incredible record in Mixed Doubles titles of winning 12 out of 13 consecutive Grand Slam titles. She won 7 titles in a row. Had she not lost the final of the Wimbledon Mixed doubles title in 1964, she would have achieved 3 consecutive Calendar Grand Slams in Mixed Doubles. Further, she actually won 13 out of 14 Grand Slam tournaments that she entered, having been absent from 3 consecutive tournaments in 1962 after the first of those Grand Slam titles. As history stands, she has achieved one singles Calendar Grand Slam and two mixed doubles Calendar Grand Slams - more Grand Slam achievements than any other player in history.