Exactly. Let us look at the Year End Top-5 in the 90s: 1991: Edberg, Courier, Becker, Stich, Lendl (and 6º and 7º were Sampras and Forget) 1992: Courier, Edberg, Sampras, Ivanisevic, Becker. 1993: Sampras, Stich, Courier, Bruguera, Edberg. 1994: Sampras, Agassi, Becker, Bruguera, Ivanisevic. 1995: Sampras, Agassi, Muster, Becker, Chang 1996: Sampras, Chang, Kafelnikov, Ivanisevic, Muster. 1997: Sampras, Rafter, Chang, Bjorkman, Kafelnikov. 1998: Sampras, Rios, Corretja, Rafter, Moya. 1999: Agassi, Kafelnikov, Sampras, Enqvist, Kuerten. 2000: Kuerten, Safin, Sampras, Norman, Kafelnikov. 2001: Hewitt, Kuerten, Agassi, Kafelnikov, Ferrero. ... You can clearly see that serve-and-volley, all-court players and very aggresive baseliners were rewarded in the 90s (specially in the first half), but the second half of the 90s there were more baseliners (aggresive ones and top-spinners counter-punchers as well) than serve-and-volley/all-courters, and in the 00s you basically only see baseliners, and in the very last years you have the best defenders baseliners coping the top-4. This has A LOT to do with the slowing down of conditions of the game (that started as early as 1995 (with the change of balls in Wimbledon'95 and the change of several carpet tournaments like Stuttgart'95 and Paris-Bercy'95 to slower carpets and several top-players like Becker and Ivanisevic complaining about it) and continued on and on to an extreme in the last decade, and it has to do as well (to a lesser degree) with copoly-string technology that some players started using in the late 90s ( Costa in 1996, Kuerten in 1997 ) and almost everybody joined them at the beginning of the 00s.