Decided to have fun and break it down to decades from 1930 on.
1930's
Serve-Ellsworth Vines, John Doeg
Backhand-Don Budge, Nusslein
Forehand-Fred Perry, Nusslein
Volley-Vines, Borotra
Return of Serve-Budge
Speed and Footwork-Perry
Overhead-Vines
1940's
Serve-Jack Kramer
Backhand-Frank Kovacs or Don Budge
Forehand-Pancho Segura
Volley-Kramer, Ted Schoeder
Return of serve-Bobby Riggs, Frank Kovacs or Budge
Speed and Footwork-Segura or Riggs
Overhead-Kramer
1950's
Serve-Pancho Gonzalez, Lew Hoad
Backhand-Ken Rosewall, Kovacs
Forehand-Pancho Segura
Volley-Frank Sedgman
Return of Serve-Ken Rosewall, also Kovacs, Segura
Speed and Footwork-Ken Rosewall
Overhead-Kramer, Gonzalez or Lew Hoad
1960's
Serve-Gonzalez or John Newcombe
Backhand-Ken Rosewall or Rod Laver with a nod to Rosewall, also Arthur Ashe
Forehand-Rod Laver, Gimeno, Tom Okker or Newcombe
Volley-Ken Rosewall, Rod Laver, Tony Roche
Return of Serve-Rosewall, Laver
Speed and Footwork-Rosewall, Laver, Roy Emerson, Tom Okker
Overhead-John Newcombe
1970's
Serve-Newcombe, Roscoe Tanner, Arthur Ashe, Stan Smith, Borg
Backhand-Connors, Rosewall, Vilas, Laver, Bjorn Borg, Arthur Ashe-slight nod to Connors
Forehand-Clearly Bjorn Borg. Others-John Newcombe, Ilie Nastase, Tom Okker.
Volley-Newcombe, Roche, McEnroe, Rosewall, Brian Gottfried (the man who was rumored to practice tennis on his wedding day.)
Return of Serve-Borg, Connors, Rosewall, Laver
Speed and Footwork-Borg first, also Nastase, Okker and Gerulaitis. Connors excellent also.
Overhead-Dick Stockton
1980's
Serve-Boris Becker, Ivan Lendl, John McEnroe, Bjorn Borg
Backhand-Borg, Edberg, Connors, Lendl, McEnroe, Agassi, Wilander, Miloslav Mecir
Forehand-Lendl, Borg
Volley-McEnroe and Edberg.
Return of Serve-Connors, Agassi, Lendl, Edberg, McEnroe, Borg, Mecir
Speed and Footwork-Borg, Wilander, Lendl, Gerulaitis, Wilander, Miloslav Mecir
Overhead-Yannick Noah-He always put the ball in the stands, it seemed.
1990's
Serve-Pete Sampras, Goran Ivanisevic, Becker, Edberg
Backhand-Edberg, Agassi, Chang
Forehand-Agassi, Bruguera, Jim Courier, Pete Sampras, Chang
Volley-Edberg, Sampras, Rafter
Return of Serve-Agassi, Chang. Saw a stat on Tennisweek that Chang actually broke serve by percentage more than Agassi.
Speed and Footwork-Chang, Sampras,
Overhead-Sampras
2000's
Serve-Sampras, Roddick, Kuerten (underrated serve)
Backhand-Kuerten, Nadal, Djokovic, Safin, Nalbanian (Nalbanian's backhand when he is on his game is incredible.)
Forehand-Federer, Nadal
Volley-Rafter, Henman, old Sampras
Return of Serve-Agassi, Nadal, Coria, Federer, Murray, Hewitt
Speed and Footwork-Nadal, Federer, Djokovic, Murray, Hewitt
Overhead-??? Everyone seems very good.