He was given captaincy nod just ahead of the World Cup.
Dimuth got an inconsistent side to perform to their best capability.
Their wins over England and West Indies were positive moments.
Players' shot selection hurt Lanka badly.
How did the others fare?
Mashrafe Mortaza's Bangladesh showed character and promise, but lacked the intent. South Africa's Faf du Plessis looked off as a leader. Gulbadin Naib's lack of experience hurt Afghanistan. West Indian skipper Jason Holder missed the plot and didn't offer much.