Reason for all is serve & volley.
I'll mention some oldies that I've never seen live here but since YT now allows some long clips, I can say I've seen them play.
Richard Krajicek - youth idol
Rod Laver - class
John McEnroe - the one and only one
Pete Sampras - no comment
Stefan Edberg - grace
Arthur Ashe - great YT moments
Ken Rosewall - WCT Finals 1972 !!
Michael Stich - smooth serve
Tim Henman - RG 2004 !
Jan Siemerink - Low Countries solidarity, lol