Top 5 Captains by winning %, for those to captain 20 matches
Steve Waugh, 57 tests, 41 wins, 9 losses and 7 draws (71.93%)
Don Bradman, 24 tests, 15 wins, 3 losses and 6 draws (62.50%)
Ricky Ponting, 77 tests, 48 wins, 16 losses and 13 draws (62.34%)
Lindsay Hassett, 24 tests, 14 wins, 4 losses and 6 draws (58.33%)
Mike Brearley, 31 tests, 18 wins, 4 losses and 9 draws (58.06%)
Unsurprising top 5 really, with Waugh and Ponting, along with Bradman, playing in some of the best teams of all time. Hassett, inherited the captaincy and a wonderful team from Bradman. Brearley's captaincy period was dominated by Botham, in his peak. Bradman and Brearly both have a very low percentage of losses. While Steve Waugh dominates in terms of draws.
For the record, Viv, had a winning percentage of 54, but a huge 30% draw rate. Imran Khan was captain for 48 tests, and only won 14 (29.17%). Under his captaincy, Pakistan drew more than half the games they played, having a low percentage of losses.