1. John Buchanan
A man who did marvels for the mighty Australians, John Buchanan proved to be a gem of a coach for the star-studded Australian team. He took over the Australian team as the head coach after their 1999 World Cup victory. He led his team to staggering wins in World Cup 2003 and 2007, ICC Champions Trophy in 2006, Ashes win in 2001 and 2001-03, series win in India after 36 years and a lot more.
The scintillating record of 16 consecutive Test match victories and 23 ODI victories in World Cup matches just helped his staggering record of an overall 79.83% winnings. He has also coached Kolkata Knight Riders in IPL, consulted England for their Ashes tour and remained as the New Zealand Director of Cricket. It may be claimed that his career coincided with some of the greatest Australian players, but still he is the most successful cricket coach in term of statistics.