Evan Lendl
14 grand slam singles
Don Budge has won 6 Grand Slam Singles Titles.
Chris Evert appeared in 34 Grand Slam singles title matches and had a record of 18-16. Martina Navratilova appeared in 32 Grand Slam singles title matches and had a record of 18-14. Steffi Graf appeared in 31 Grand Slam singles title matches and had a record of 22-9.
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.
Yes, there has been an inside-the-park grand slam in baseball history.
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14 Grand slam men's singles titles
Pete Sampras has the most Grand Slams with 14.
It's Steffi Graf - she has won 22 Grand Slam singles titles, including the Golden Slam (all four Grand Slams in a year + the Olympic Gold Medal in singles, in 1988). Martina Navaratilova has won the most number of doubles Grand Slam titles. She is also the leading winner of overall Grand Slam titles.
Martina Navratilova
As of Wimbledon 2008, Venus Williams has won 8 Grand Slam singles titles and 6 Grand Slam doubles titles but never all four Grand Slam events in the same year.
Jimmy Connors and Andre Agassi are two former, top US players who won 8 singles Grand Slam titles.However, the question does not stipulate whether the grand slams need to be only singles, or whether they are just Grand Slam titles[period]. There may be others, male or female, who won 8 Grand Slams, inclusive of singles, doubles and mixed doubles titles.