The delivery was invented by the Pakistani cricketer Saqlain Mushtaq.
A doosra is a particular type of delivery by an off-spin bowler in the sport of cricket. The doosra spins in the opposite direction to an off break (the off-spinner’s default delivery) and aims to confuse the batsman into playing a poor shot.
A variety of bowlers have made considerable use of the doosra in international cricket. Other Pakistanis who use it include Shoaib Malik and Saeed Ajmal. Users from other nations include Sri Lankans Muttiah Muralitharan and Ajantha Mendis, Indian Harbhajan Singh and South African Johan Botha.
The doosra is a relatively new type of delivery. Although some credit Saqlain Mushtaq with its invention in the 1990s, the history of off spinners turning the ball either way goes back as far as the late 1950s, when West Indian Sonny Ramadhin was able to achieve this. However, the first finger offspinner’s doosra is credited to 1980s Indian spinner Rajkumar Sharma.  The naming of the delivery is attributed to Moin Khan, the former Pakistani wicketkeeper, who would call on Mushtaq to bowl the “doosra” (the other one) from behind the stumps. Tony Greig, a commentator in one of these matches, eventually linked the word to the delivery and confirmed it with Saqlain in a post-match interview. Thus the term became a part of cricketing culture. The doosra is now an important part of the off-spin armoury.