The former Proteas captain received no real support from the rest of the batting with only Delhi skipper Axar Patel striking 43 as his team could reach 190-9 chasing a target of 205.
Kolkata's West Indian spinner Sunil Narine was the chief destroyer for his team with figures of 3-29 while fellow slow-bowler Varun Chakravarthy took 2-39.
Earlier, the Knight Riders reached a total of 204-9 in their 20 overs thanks mainly to Angkrish Raghuvanshi who hit 44 off 32 balls while Rinku Singh smashed 36 off 25 deliveries.
It was the Knight Riders' fourth win in 10 matches this campaign and they are seventh in the standings while Delhi are fourth ater slipping to their fourth defeat.
Former Proteas captain Faf du Plessis has confirmed that he will not put his name in the auction for the 2026 Indian Premier League, and has instead decided to play in the Pakistan Super League.
Former India player Abhishek Nayar has been appointed head coach of the Kolkata Knight Riders in the Indian Premier League.
New Zealand veteran Kane Williamson has been signed by Indian Premier League franchise Lucknow Super Giants, albeit in a different role
In a major coup for the Big Bash League, Sydney Thunder have signed former India spinner Ravichandran Ashwin on a two-year deal.
