Pietersen vows to improve batting form

England's Kevin Pietersen is frustrated by his one-day form and admits he will "need to change" the way he plays if he is to improve ahead of the third game of the one-day series with Pakistan on Saturday.

Pietersen, who has scored just 14 and 26 in the two victories so far, says it has been "very challenging" to secure runs in the latest series, but insists he wants to continue as England's opening batsman.

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