There is quite a high level of ignorance and misconception regarding the influence of technology as opposed to highly significant changes in technique on the professional game.
As an aside, I have seen several players from the 1970s and 1980s and, quite frankly, they would be crushed, using the type of gentle 'half-swing' technique they had back then. Assuming they were equipped with today's I just can't see them generating enough power - or getting anywhere close to cope with the pace generated by today's players. It is insightful to note that of the players of his generation, 1970's player John Lloyd (commentating at Roland Garros 2006, for the BBC) thought that only Bjorn Borg (who he also claims to be 'faster' than Blake or Nadal) alone would be competitive off the ground with the players of this generation.
During the rain at Wimbledon, players such as Chris Evert, Tracy Austin, John McEnroe, Virginia Wade, Martina Navratilova etc. etc. often discuss (the best) players' strokes and, inevitably, they select the strokes of this, or very recent, generations as being 'the best' in the women's game. Indeed, Tracy Austin selects today's players [Serena, Henin-Hardenne, Davenport, Venus (backhand)] as having the best (ever) strokes in the game. The only player player from a previous era that receives a mention is Graf (forehand). However, Navratilova and Billie Jean King are frequently credited with their volleying skills. Of today's players, Tracy Austin seems to feel that only Mauresmo and Henin-Hardenne are the only truly gifted volleyers, among today's top female players.
Austin regularly points out that groundstrokes are far better technically today than during her career, or at any point in the past and that many of leading players of her generation had real technical 'weaknesses' off the ground. Tracy commented that Navratilova was 'weak' off the ground until well into her professional career - though not while Navratilova was in the studio. Chris Evert [in a studio discussion at Wimbledon 1998] commented that groundstrokes had improved vastly since the end of her playing career, pointing to players such as Hingis, Davenport and Seles. Evert also made the specific point about passing shots becoming more accurate and controlled than in her era.
Jo Durie (who is now professional coach and commentator for eurosport), says that you "cannot compare" the baseline play from her era that of today. Moreover, she recalls how certain players players (Seles and Capriati) arrived on the Tour in the late 1980s/ 1990s and literally 'blew' her peers "off the court'. At the time, Seles and Capriati were both teenagers; neither were physically strong, and did only limited physical training. Jo Durie was rather taller (6 ft+), and physically stronger, than a coltish fifteen year-old Capriati - yet she laughs (now) at the difference in power, when they played, back in the early 1990s (Durie lost 6-1 6-2). Capriati's Prince Mid racquet was smaller and less 'powerful' than Navratilova's Yonex Midplus frame. Both Capriati's and (especially) Seles' technique and game-style was a portent of what was to come. On a broader scale, Steffi Graf, Monica Seles and Jennifer Capriati all made their impact upon the professional game in the late 1980s and 1990s. All three were using racquets made of the same material(s) that Navratlova used - and Steffi's Wilson and and Jennifer's Prince frames were smaller than Navratilova's Yonex frames of the late 1980s/early 1990s. Yet Steffi, Monica and Jennifer all hit a heavier/faster ball off the ground than Martina, sometimes by an acute margin. Jo Durie made the point that even as 13-14 year-old, the Tour novice Jennifer Capriati was hitting the ball much, much harder than far taller and physically stronger women - and with 'humiliating' results. Capriati destroyed the confidence of senior Tour players by hitting right through - and past - them. At the time Capriati was small and ertainly not physically imposing, as was the 16 year-old Monica Seles. As a coach, Jo Durie fully understands (and appreciates) the changes in technique and the levels of fitness (movement is far more 'explosive' than before) that have transformed the game. In her eurosport broadcasts from WTA tournaments throughout the year, Durie also provides a technical description of how groundstrokes have changed mechanically :
* far longer swings
* far greater trunk and shoulder rotation
* changes in playing stance etc. etc.)
- though she does say that changes in racquet technology partly enabled these mechanical changes to occur within the game.
The downside of longer, and far more aggressive (and faster) swings, is that injuries are far more prevalent on both Tours than at any point in the past. Many injuries (to the trunk, abdomen) have increased exponentially, as an ATP trainer, working at Queen's Club (London) pointed out. He said that these kind of injuries hardly occurred back in the 1980s but are now commonplace today...