There are no standalone shots in tennis. Every shot either begins after a serve or a return. Now, consider the following: Was his FH powerful enough to hit through the best baseliners of his era ? Yes Was his FH consistent enough to stand in rallies against the best baseliners of his era ? Yes Was his FH approach shot among the best in his era ? Yes, it was the best in the OE. Was his running FH the best in the OE ? Yes, it was. Was he able to hit his FH inside-out/CC/DTL ? Yes Sampras had one of the best FH's, ever.