Amid increasing speculation about his worth to the team, the 36-year-old right-hander contributed a top score of 88 to temporarily quell the rising tide of criticism at his position in the batting line-up ahead of prolific youngster Babar Azam.
Opening batsman Ahmed Shehzad benefited from an early slice of luck to get to 67 while Shoaib Malik, who also capitalised on poor out cricket by the West Indies, flailed away for 53 off 38 deliveries as Pakistan set a new record for the highest ODI innings at the venue and also equalled their highest total against the West Indies in the 50-over format of the game.
In contrast, the other frontline spinner in the West Indies line-up, Devendra Bishoo, was only the sixth bowler used by captain Jason Holder, conceding 36 runs from six wicketless and unthreatening overs.
Playing on a surface relaid after continuous complaints about its low and slow nature since the ground was opened for the 2007 World Cup, Holder admitted to a cautious approach in choosing to field first on winning the toss.
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However there was no hesitancy from the Pakistan opening pair with Shehzad and Kamran Akmal flaying opening bowlers Shannon Gabriel and Alzarri Joseph to all parts of the ground.
Leg-spinner Shadab Khan, who marked his first international appearances at senior level with two man of the match performances and man of the series award in the tourists' 3-1 T20 series triumph, is making his ODI debut for Pakistan in a bowling line-up that shows the return of left-arm fast bowler Mohammad Amir.
West Indies, who have never successfully chased a total of 300 or more in an ODI, are seeking a clean sweep of the series to move ahead of Pakistan at number eight in the international rankings.