Kevin O'Brien against England in world cup 2011
the fastest half century in T20 was scored by Sanath Jayasuriy in 12 balls
Sahid afaridi has scored the fastest century in just 37 balls
New Zealand Player Corey Aderson scored the fastest century in 37 balls.
John Davison of Canada hit the fastest century off 67 balls in the 2003 World Cup.
Virender Sehwag (300 of 278 balls)
its nj astle in 2001-02just in 153 balls
in 57 balls by Adam Gilchrist against England.
Virender Sehwag scored century in 60 balls against New Zealand in 2009
virender sehwag 319 runs in 304balls
Ajit Agarkar of India has scored the fastet half century in just 22 balls against zimbabwe in 1999