Resumes:
Rafael Nadal: 14 Grand Slams, 3rd in open era, 23-10 Record vs. Federer, Career Grand Slam, Olympic Gold. 9x French Open winner = King of Clay. 29 years old
Roger Federer: 17 Grand Slams, 18 if he wins Sunday. Career Grand Slam. Most slams of all time. 33 years old, turning 34 in a month.
Pete Sampras: 14 Grand Slams. 7x Wimbledon and 5x US Open tied for 1st in each. One of the best serve/volley players.
Rod Laver: 11 grand slams. World #1 for seven straight years, spanning before and after the start of the open era. Would have gotten more than 11 grand slams if they existed during part of his prime. Accomplished in doubles as well.
Other: ??? Make your case...
Your vote: Rod Laver