Sehwag was his usual attacking self as he blasted 63 off 39 balls after electing to bat, but the ball was not coming on to the bat and other Delhi batsmen struggled to score quickly.
Rajasthan's bowling too was tight and except the last over when they leaked 20 overs, they made the formidable Delhi batting line-up to work hard for runs.
Apart from Sehwag, who now is highest run scorer in the current edition with 372 runs, Yogesh Nagar (27) and Ross Taylor (25) contributed to the total.
It was Nagar, who took Delhi past the 150-run mark when he hammered Amit Singh for two sixes and a four in the final over the innings before holing out in the penultimate ball.
Pankaj Singh (2/25) and Amit Singh (2/41) shared four Delhi wickets between them while Kevon Cooper did a fantastic job by conceding just 19 runs in his four overs.
Rajasthan bowler kept Delhi batsmen under pressure right from the start although Mahela Jayawardene had started off the Delhi innings with a four off Ankeet Chavan.
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But the Sri Lankan recruit did not last long as he hit a full pitched delivery from Pankaj right into the hands of Brad Hogg.
Pietersen, who followed Jayawardene looked to carry on from where he left against Mumbai Indians, driving Chavan through covers to fetch his first boundary.
Chavan cut short his stay when he had the Briton caught by Dravid in slip region.
Sehwag on the other end was in sublime form as he cut and drove Royals' bowlers with ease. After flicking Pankaj through the mid-wicket to collect his first boundary, the Delhi-dasher never looked back raising his half-century in just 33 balls.