Phil Benedict:
You're right that tennis at the top level sure has changed and it's probably mostly due to the racket evolving.
I never played tennis much but I did go to Forest Hills annually in the 1950s and early 1960s. That is of course grass and the ball does not bounce on grass anything like composite courts. That was the U.S. Opens and the era of Hoad, Rosewall, Laver, Trabert, Seixas and then later guys like Stan Smith, and a bit later Arthur Ashe. The gals were the likes of Margaret Court and Althea Gibson et al. The rallies were a lot longer and some matches could take forever as it was just before the beginning of the Van Alen Scoring System (VASS). I thought the players were a lot more stylish back then----two handed shots and excessive power in serving and returning were not much part of tennis then. It seemed like it was a whole lot more side to side strategy, and more often the beautiful back court lob compared to today's ultra power tennis. Trabert was really strong but even his style was nothing like players today or even the next generation like Connors and MacEnroe.