After 25 Tests, Ian Botham had 1336 runs @ 40.48 and 139 wkts @ 18.52... is the best all-round record ever in their first 25 Tests?
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Botham the best by some margin, if you take into account wickets taken. In fact he is third best ever in that regard over the first 25 Tests, after only Barnes (167 @ 16.97) and Waqar (143 @ 18.50). Some other notables after 25 Tests:-
Diff, BtAv, BwAv, Name, Wkts
21.96, 40.48, 18.42, Botham, 139w
21.07, 56.87, 35.80, Worrell, 35w
16.91, 45.53, 28.62, Dexter, 29w
14.26, 44.92, 30.66, Greig, 70w
11.48, 57.42, 45.94, Sobers, 31w
9.75, 39.63, 29.88, McMillan, 64w
8.91, 34.98, 26.07, Asif Iqbal, 45w
7.34, 38.22, 30.88, Kelleway, 52w
6.82, 39.43, 32.61, Oram, 49w
4.69, 28.03, 23.34, Rhodes, 82w
4.50, 31.91, 27.41, Gomez, 58w
4.15, 32.82, 28.68, MG Johnson, 110w
1.41, 23.80, 22.39, Davidson, 77w
0.85, 29.90, 29.05, Mankad, 108w
-4.73, 21.93, 26.66, Giffen, 94w
-5.63, 40.32, 45.93, GRJ Matthews, 46w
-7.22, 31.96, 39.18, DJ Bravo, 55w
-7.47, 27.98, 35.45, CL Cairns, 69w
-8.35, 23.76, 32.11, RMH Binny, 47w
-9.40, 22.49, 31.89, Imran, 98w
-10.90, 21.05, 31.95, 58w
-11.21, 16.40, 27.61, Akram, 76w
-11.35, 19.17, 30.52, Hadlee, 102w
-16.66, 16.35, 33.01, BL Cairns, 72w
-25.65, 24.28, 49.93, Flintoff, 41w
-30.98, 20.89, 51.87, Intikhab, 39w
And of course
+60.26, 91.26, 31.00, Bradman, 1w