Tamil Nadu beat Baroda by seven wickets in the final.
Karthik handed over the reins to his deputy Morgan hours before their IPL match against Mumbai Indians.
Karthik told the KKR management that he wants to "focus on his batting and contributing more to the team's cause."
Kolkata Knight Riders pulled off a stunning two-run victory.
The quick wickets of a set Rayudu and Watson turned the tide in favour of KKR.
A few of Karthik's baffling decisions apart from his own poor run with the bat -- 37 runs from four matches -- has put the wicketkeeper-batsman in the line of fire.
"Genuinely feel Eoin Morgan should lead the side, surely not DK. World Cup-winning captain should surely lead IPL side," Sreesanth tweeted after KKR suffered an 18-run defeat to Delhi Capitals on Saturday night.
Much was expected from a revamped KKR set-up but it seemed Karthik did not learn from his past mistakes and made some inexplicable decisions that led to their capitulation against Mumbai Indians.
KKR would look for a perfect start as it will be a battle between big-hitters on both sides on a sluggish Abu Dhabi track.
Karthik stated he was almost sure to be snapped up by CSK as he was 'the biggest name from Tamil Nadu' in the inaugural IPL auction. But the move never materialised as CSK went for Dhoni.