Yuvraj Singh (12 balls) holds the record for the fastest T20I 50 by an Indian. In the wake of Dube and Abhishek's batting exploits in the series against the Kiwis, we look at three Indian players who, you may not know, have scored a T20I half-century in less than 20 balls. AdTrending#1 Gautam Gambhir (19 balls) vs Sri Lanka in Nagpur - December 2009Former India opener and current head coach Gautam Gambhir reached a half-century off just 19 balls in an T20I against Sri Lanka in Nagpur in December 2009. In the chase, Gambhir and Virender Sehwag (26 off 14) got India off to a flyer, adding 32 in 2.5 overs. Gambhir reached a 19-ball 50 by guiding Angelo Mathews for a couple fine of third man.