Right now...Pete Sampras is at the top with 14 Grand Slam titles, next is Roger Federer.
But when I research (on wikipedia), they discussed that Bill Tilden was the greatest player...then there is Donald Budge who is the 1st person to win all four grand slam titles...
that's all I know so I really have no idea who is the 1st person to rank #1 in tennis.
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