South Africa scored 272 for seven and then skittled Pakistan out for 140 in 42.5 overs on Sunday.
Pollock batted aggressively at the end of the South Africa innings to score 57 off 51 balls before taking three for 12 from 9.5 economical overs.
Jonty Rhodes had top scored for the hosts with a gritty 98, while Nicky Boje matched Pollock by taking three wickets to peg back the tourists.
Pakistan batted without urgency and were never in the hunt for victory. Salim Elahi's 31 was the best effort in an innings in which 23 was the highest partnership.
Wasim Akram, by far the pick of Pakistan's bowlers with 3-19, drew first blood in the third over when Herschelle Gibbs was caught behind without scoring.
Six overs later Neil McKenzie mistimed a pull shot off Muhammad Sami and was caught by Yousuf Youhana at square leg for 11.
Boje and Jacques Kallis fell to similar strokes, Boje to Muhammad Sami for 20
That reduced South Africa to 86 for four in the 21st over, the signal for Graeme Smith and Rhodes to begin rebuilding the innings with a partnership of 65 runs off 71 balls.
The stand was ended in the 33rd over when Wasim Akram speared an express yorker past Smith's outside edge to bowl him for 56. Smith faced 90 balls and hit four fours.
South Africa slipped to 151 for six two balls later when Mark Boucher chopped a delivery from Wasim onto his stumps to be bowled for a duck.
Rhodes and Pollock then added 99 off as many balls for the seventh wicket before Rhodes skied Waqar Younis to wicketkeeper Rashid Latif, earning the fast bowler his 400th one day wicket.
Rhodes faced 92 balls and hit 12 fours and two sixes.
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