(Forgive the length of this - but I got inspired)
Luxilon Borg said:
I absolutely believe Sampras was NO worse a player in 2001 then he was in 1997. The fact is he got stale ...and for years he had it easy with no body except Agassi being able to get into a rally with him. He got spoiled. Then when guys like started making him, play, he was not able to physically cope.
This really seems like a stretch to me, Lux, although it is an interesting statement. I was only a casual fan back then so can't really comment on his on-court performance, but his record disagrees with you. Consider, for instance, his winning percentage from 96 to 2002: 86%, 82%, 78%, 83%, 76%, 69%, 61%. There's a clear trend of decline, especially from 1999 to 2002.
But your opinion inspired me to research a bit further, so I thought I'd look into who and where Pete lost, comparing 1997 and 2001.
Key: Rank - Player - round, tournament (surface type)
1997 (12 losses)
25 - Magnus Larsson - RR, Davis Cup (indoor carpet)
7 - Carlos Moya - RR, World Tour Finals (indoor hard)
15 - Richard Krajicek - R16, Stuttgart Masters (indoor carpet)
16 - Petr Korda - R16, US Open (outdoor hard)
37 - Magnus Larsson - R16, Indianapolis (outdoor hard)
24 - Jonas Bjorkman - QF, Aegon (outdoor grass)
65 - Magnus Norman - R32, Rland Garros (outdoor clay)
21 - Mark Philippoussis - RR, World Team Cup (outdoor clay)
24 - Jim Courier - R64, Rome Masters (outdoor clay)
43 - Magnus Larsson - R32, Monte Carlo Masters (outdoor clay)
35 - Sergiy Bruguera - SF, Miami Masters (outdoor hard)
43 - Bohdan Ulihrach - R32, Indian Wells Masters (outdoor hard)
Comments: What is most striking to me--aside from Larsson's dominance of Pete, 3-1 that year, although 1-6 in other years--is that all but one of Pete's losses in 1997 were to players outside of the top 10. Against top 10 opponents he was 13-1, a 93%, while against everyone else he was 42-11, or 79%. This implies that he saved his best for the best, and relaxed a bit (too much) against non-elites.
2001 (16 losses)
53 – Max Mirnyi – QF, Stuttgart Masters (indoor hard)
4 – Lleyton Hewitt – F, US Open (outdoor hard)
16 – Tommy Haas – F, Long Island (outdoor hard)
38 – Alberto Martin – R32, Cincinnati Masters (outdoor hard)
3 – Andre Agassi – F, Los Angeles (outdoor hard)
15 – Roger Federer – R16, Wimbledon (outdoor grass)
6 – Lleyton Hewitt – SF, Aegon (outdoor grass)
76 – Galo Blanco – R64, Roland Garros (clay)
2 – Marat Safin – RR, World Team Cup (clay)
50 – Alex Calatrava – R64, Hamburg Masters (clay)
54 – Harel Levy – R64, Rome Masters (clay)
119 – Andy Roddick – R32, Miami Masters (outdoor hard)
4 – Andre Agassi – F, Indian Wells (outdoor hard)
43 – Andrew Ilie – R32, Scottsdale (outdoor hard)
96 – Chris Woodruff – R32, Memphis (indoor hard)
54 – Todd Martin – R16, Australian Open (outdoor hard)
Comments: The first noticeable difference is that Pete lost to a lot more top 10 opponents, going 5-5 overall (50%) compared to 30-11 to everyone else (73%). So while he played worse overall, it was most marked against the elite. He also lost to a lot of young and up-and-coming stars: twice to Hewitt, once each to Haas, Safin, Federer, and Roddick. He also played poorly against Agassi, going 1-2.
Conclusions: The record shows decline overall, but most especially against two, sometimes overlapping, demographics: top 10 opponents, and younger players. This leads me to believe that the main differences in Sampras in 1997 vs. 2001 was that the older Sampras didn't have quite the same competitive edge, and secondarily that he couldn't adjust to this new generation. Whether or not his actual physical skills had eroded is hard to say, but given the clear importance of mentality to a player's overall performance, even if he “only†declined in terms of his confidence and competitiveness, there is clear signs of decline, at least as reflected in the record.
It is my opinion is that the players who remain successful deep into their 30s—Connors, Agassi, and Federer come most readily to mind—are those that are able to fuel the competitive fire, play for love of the game, and do the extra work that is necessary to compensate for declining physical skills. As anyone over 30 knows, the body changes – it takes more and more work to maintain fitness as the law of diminishing returns begins to take effect. It may be that those who decline in their late 20s, are those that lose that extra bit of fire, and perhaps those that can't quite deal with the fact that their physical skills aren't quite as sharp. It seems that Pete Sampras might be such an instance. He had enough left to light the flame and win the 2002 US Open, but perhaps he knew that he wouldn't be able to do it again so called it quits.
This has relevance today, as we see a similar situation playing out with Rafael Nadal, who looks similar to latter-day Pete, although may be showing more physical decline than Sampras did. But maybe Rafa can muster that fire once more and push through and win another Slam. We'll see in a few months.
Warning: Federer adulation to come. If you're sick of Fedlove, end reading now
On the other hand, we have Roger Federer, who is now many years from his best, but still better than almost everyone, and clearly loves playing enough to keep going. One thing that is remarkable about his performance is that he's doing it despite the fact that he's so far removed from 2004-07. I imagine that after Rafa took the #1 ranking in 2008, he thought "I've got to get it back." And then he did, and looked great going into 2010, after winning the AO. But then he slipped a notch, and this having nothing do with the young players coming up. Rafa's dominance over him continued, and this was before Novak rose to greatness in 2011. But he weathered on, and even managed to win "one more" in 2012, just like Pete did in 2002 - and at the very same age. But then he did something that Pete didn't do. He continued and then had his worst year on a decade. But did he retire? No, he adapted his game, and now he looks like he could remain a top 5 player to the age of 40.