5 most economical 4-over T20 spells Mohammad Irfan went past 

#3 Sohail Tanvir (5/3 against Barbados Tridents)

Tanvir was at his lethal best in this spell

Pakistani left arm pacer, Sohail Tanvir, also makes this list. Tanvir, while playing for the franchise Guyana Amazon Warriors, ripped apart the Barbados Tridents batting line up. In his spell of four overs, Tanvir bowled a maiden over, gave away just three runs, and dismissed half of the opposition batters. As a result, the Barbados Tridents were bowled out for just 58 runs.

Man of the Match Tanvir, had an economy rate of 0.75 runs per over in his five wicket spell.