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The Doosra is a ball with a longer tradition than you may think.
An Australian bowler called Jack Potter was bowling these bad boys roughly 30 years before Saqlain Mushtaq even came on the scene. Jack never did play for Australia, but he does hold the record for being 12th man the most for Australia without ever winning the cap.
But I digress. The fact is that the doosra has a long tradition.
The elephant in the room about this ball is a simple question though