As promised, here is the second part of the statistics Dan asked for... that is, a comparison of their Test careers. I am not going to go through the task of comparing their ODI careers because I personally believe Hayden is a far better ODI player than Sehwag. This is somewhat ironic because it appears that Sehwag's game is tailored towards ODI's, but I believe Sehwag is far too aggressive in ODI's and is unable to find a middle ground. That said, he has become a lot more consistent in ODI's of late, so maybe it is valuable to look at him again, in a couple of years.
After 25 matches
Matthew Hayden
Runs: 1778 @ 43.36
100's/50's/ducks: 5/7/6
HS: 203
Virender Sehwag
Runs: 2157 @ 53.92
100's/50's/ducks: 7/6/4
HS: 309
After 50 matches
Matthew Hayden
Runs: 4488 @ 58.28
100's/50's/ducks: 17/14/7
HS: 380
Virender Sehwag
Runs: 4103 @ 51.28
100's/50's/ducks: 12/12/8
HS: 309
After 66 matches
Matthew Hayden
Runs: 5674 @ 54.03
100's/50's/ducks: 20/20/7
HS: 380
Virender Sehwag
Runs: 5617 @ 51.06
100's/50's/ducks: 15/18/10
HS: 319
As you can see, Sehwag made a better start to his career, whereas Hayden had a better middle of his career. Hayden was completely sublime in the middle of his career, which coincided with his "rebirth" after India 2001. He was unarguably the best opening batsman during that time. However, if you look at the final statistics based on Sehwag's 66 games played, you will notice that runs-wise, they are nearly equivalent. In fact, Hayden has played 115 innings for his 47 extra runs, compared to Sehwag's 114 innings. The difference? Not outs. Hayden has 10, compared to Sehwag's 4. Domination? Let's break it down a little further:
Hayden not outs
28* v. India - Target: 47
6* v. England - Target: 14
3* v. South Africa - Target: 10
21* v. South Africa - Target: 53
100* v. West Indies - Lead: 168
2* v West Indies - Target: 8
101* v. Zimbabwe - Target: 172
53* v. India - Target: 97
56* v. Pakistan - Target: 127
23* v. Pakistan - Target: 62
Sehwag not outs
12* v. Australia - Target: 229 ; Match drawn
14* v. Zimbabwe - Target: 19
76* v. England - Target: 144
201* v. Sri Lanka (first innings) - Carried his bat
Interesting decomposition there, which I think has a lot to do with why Hayden's average is higher. Of his 10 not outs, 6 are while chasing a target of less than 100 while 1 is while setting a target. The other three were potentially tricky targets, but Australia chased them down fairly easily. I would say that most of these innings were pretty good opportunities to boost Hayden's averages, and that the Aussie bowlers could be attributed much of the success in those games. In comparison, one of Sehwag's 4 targets have come chasing a measly target, one in a potentially tricky target (that was eventually easily chased), one in a drawn game that was dead by the time Sehwag came in and one where he carried his bat. I'd say the 26 runs that Sehwag added in the drawn game and Zim game were worthless runs, whereas the 76 and especially the 201 made were crucial.
Of course, this is taking nothing away fro Hayden's achievement of guiding his team to victory many times and staying there right till the end. In that regard, I suppose Sehwag was more like Langer, who seemed to fall cheaply whenever a small target was being chased. However, one can fairly accurately conclude that the Australian bowlers gave Hayden a lot more opportunities to score a few runs here and there and take a not out... in fact, at least a 130-odd runs compared to Sehwag's 26. That's like an unbeaten century!
In my final segment to this discussion, I will take a look at some of the other factors one can use between comparing the two, including how big their centuries tended to be, as well as age/generation-based breakdown. I think I will find that based on age, there is no real comparison possible at the moment!
sohum added 8 Minutes and 28 Seconds later...
But that's the way Sehwag plays, if he had batted cautiously after that, it would have not been his real game, and who knows, could have easily gotten out anyway.
I don't know about you, but I believe a player should just play his best game, his natural one. You could argue that he should have played according to situation, but if he did that from the start then, we would have had absolutely no chance of a victory.
In my opinion, there is no need for Sehwag to change his technique in Tests as it is today, as long as his body keeps up with it. 2008 was one of his most successful years in Test cricket, and I think he has definitely made some changes that contributed to that. He still feasts on spinners and he is still susceptible to the in-swinging delivery, but you will notice that he has cut down on a lot of the slashes at wide deliveries. He is also susceptible against the moving ball, and I don't know if he's done anything to change that because he's played mostly in India this year. I guess we will get an idea of that in NZL.
That said, there will come a time, maybe around 4-5 years from now when Sehwag, if he's still in the team, will have to change his technique or face the axe. His talent comes from his superb hand-eye coordination and the lack of need to think about footwork (hence keeping his mind pretty clear). Unfortunately, time is going to catch up with him and his hand-eye coordination is going to worsen. He will have to modify his style then, similar to what Tendulkar has done in this millennium, if he wants to continue to play and succeed.