Ajit Agarkar of India has scored the fastet half century in just 22 balls against zimbabwe in 1999
Robin Uthappa scored the first ever half century for India in twenty20 cricket, on 14 September 2007 against Pakistan.
MD. samsul bari from brahman baria
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.
The first half-century by a Bangladesh player was scored by Azhar Hossain in the sixth One-Day International match in which they played.
Mehrab Hossain was the first Bangladeshi batsman to score a 50 in Cricket World Cup. He scored 64 against West Indies in 2009 world cup.
Yuvraj singh of the indian cricket team against england scored the half century of just 12 balls hitting six sixes of stuart braod's over and taking india to the victory he completly smashed broad all round the park and lter judged man of the match