South Africa vs England series 1904 – South Africa won the series 4-1
South Africa vs England series 1906 – England won 1-0, South Africa were on the verge of victory in the third test, needing less than a hundred runs with 5 wickets in hand.
South Africa vs England series 1910 – South Africa won the series 3-2
South Africa vs England series 1912 – England won 3-0, Sydney Barnes took 34 wickets @ 8.29, without him, South Africa would likely win one of the last two games, if not both.
South Africa vs England series 1913 – England won 4-0, Barnes took 49 wickets in 4 games @ 10.94, without him, South Africa would win the third test, they were on the way to win the fourth test anyway if the game had continued.
Wow, I'd love to have that record as minnows! regardless, they were a weaker side than England and Australia, but were competitive even in Australia where their bowling attack was virtually worthless, frankly speaking, we count the records of all teams into account, when I discuss Tendulkar I don't call for his records against 90s England or Sri Lanka to be erased, that's not how Cricket works.