the fastest half century in T20 was scored by Sanath Jayasuriy in 12 balls
Robin Uthappa scored the first ever half century for India in twenty20 cricket, on 14 September 2007 against Pakistan.
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Now it is Yuvraj Singh who scored fifty in just 12 balls. It is against England in recently concluded Twenty20 world cup,in 2007,at south Africa. Yuvraj hit 6 consecutive sixes in an over to complete his half century.
Sachin's debut first-class half-century came in his debut first-class match (he scored 100 not out) for Bombay against Gujarat on December 10 - 12, 1988.