The numbers would seem to put Fed in fifth or sixth place--
Combining Grand Slam titles with Pro majors, Rosewall won 23 "major" titles in his career, Laver won 19, Federer has captured 15, and Sampras and Gonzalez both won 14.
Considering all semifinal, final, and championship results in majors, we find Rosewall at unbelievable 52 (total semifinal, final and championship results in majors), followed by Tilden (35), Laver (32), Connors (31), Gonzalez (29), and Federer (22).
Laver won at least 199 tournaments, followed by Tilden (161), Jaroslav Drobny and Connors (each 148 ), Lendl (144), Rosewall (136), Roy Emerson (114), Tony Wilding (112), Borg (100), McEnroe (99), and Federer or Sampras (64).
Gonzalez seems to be the best at World No. 1 being that for at least 6 years, tied with Sampras. Federer owned the year-end top spot for 4 years (2004-2007). But if we include those years when a player has reached a co-No.1 position, we get a significantly different picture: Gonzalez and Rosewall, each 9 years on the top, Laver at 8 years, followed by Budge, Tilden, Vines, and Kramer each 7 years.
In terms of years spent in the top-10 in the world, remember that computer rankings were not used in the pre-Open Era. Tilden and Rosewall lead with 23 years in the top-10, Gonzalez spent 22 years (if we project 1962 and 1963 when Pancho did not play but probably would have been among top ten, even top three), Budge and Segura, each 19 years.
Rosewall, Gonzalez and Tilden are the outstanding players when it comes to their longevity. All three men were formidable players into their 40s. Rosewall won majors in a remarkable range that spanned from 1953-1972.
Concerning the longest streak of winning majors, this list is headed by Rosewall (9), Tilden (8 ) and Budge (6). Concerning a streak of top placings in majors, two players are outstanding: Rosewall (34) and Federer (21). It's fair to mention that in open era such streaks were more difficult to achieve than in Rosewall's time (1954-1968 ). Rod Laver has still the record regarding big finals reached in a row 1964 to 1968: 14.
Regarding a best 5-year span or career high, the most titles in a five-year period were won by Laver (82). The best percentage of titles in a five-year belongs to Tilden (approximately .815). The most majors won during a five-year period were won by Federer (12). The best percentage of majors in five-year period keep Tilden and Vines at the top (both .1000).
Finally, if one cares to consider doubles play (Federer is rightly proud of his Olympic gold medal in doubles), in the pre-Open Era virtually all players played in the doubles competition (often even the mixed doubles), while today most top players often refuse to play doubles. The players with the most major doubles titles (excluding mixed doubles) are: Rosewall (23), Hoad (21), Newcombe (17) and Emerson (16). Bob Hewitt has won 163 doubles titles which is all-time record.