Electing to bat, Hyderabad scored a formidable 184 for one with Aaron (88) and Warner (58) stitching a 128-run stand for the unconquered second wicket and then restricted Delhi to 180 for four to record their first win of the season at the Dubai International Cricket Stadium.
Chasing a stiff target of 185 for a win, Delhi were on course at 86 for no loss at the end of first 10 overs but ran out of steam once openers Quinton de Kock (48) and Murali Vijay (52) were out in successive overs, 12th and 13th respectively.
Daredevils captain Pietersen, who made it to the playing eleven after recovering from a finger injury, struggled in his first match this season as he looked rusty and tentative, before falling for 16 in the 17th over.
Coming out to bat at number three in the 12th over at the fall of de Kock's wicket, Pietersen, who was bought this by Delhi for a whopping Rs 9 crores, took four balls to open his account and then could not hit a boundary for 13 deliveries when the team needed them to bring down the asking rate.
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In fact, Delhi lost momentum in the five overs between 12th and 16th when Pietersen and Dinesh Karthik (15) were batting. Both fell in successive balls in the 17th over off the bowling of fast bowler Dale Steyn.
Delhi needed 49 from the last three overs and Tiwary and Duminy hit a flurry of fours and sixes to give themselves a chance. Delhi needed 20 runs from the final over but Duminy and Tiwary could score only 15 to lose the match by four runs.