Having looked at 90s (mainly 99s) in Tests and ODIs, we turn to T20Is. Since there are very few 99s here, we look at 90s.
To begin with, here are the full list of 90s in T20I matches since their start in 2005:
There are only two 99s here: by AD Hales in 2012, and an unbeaten 99 by LJ Wright also in 2012. That was in the T20 World Championship.
CH Gayle is the only one to make two 90s in this format, in 2010 and 2015. On the first occasion he was captain, during the T20 world championship (not World Cup as it is often wrongly called).
90s on T20I debut:
Remember, that was the very first T20I match.
Now we look at
90s by captains in T20I:
Ponting’s 98* again, with Gayle and SPD Smith.
We take a closer look at unbeaten 90s:
The highest is 99* by LJ Wright, followed by 98* by RT Ponting, M Jayawardene and Ahmed Shehzad and 97* by HM Amla
Finally we look at unbeaten 90s in the second innings:
While Gibbs and Guptill made these scores in successful run chases, Root’s score was for a losing side.
The highest score by a captain in a successful run chase is 75* by CO Obuya for Kenya vs Netherlands in 2013. Among the Test nations, it is 73* by KS Williamson for New Zealand vs Bangladesh earlier in 2017.