According to the updated ICC ODI rankings, by virtue of South Africa's 104-run win over Bangladesh in the second ODI in Paarl, the Proteas jumped to the top spot, leapfrogging India.
While India and South Africa have identical 120 points against their name, India are placed second on the basis of decimal points.
India had claimed the top spot in the ICC rankings following their 4-1 win over Australia at home recently.
But India have a chance to reclaim their top spot as they host New Zealand in a three-match ODI series scheduled to begin in Mumbai on October 22.
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