A 4-1 series win will put India at par with South Africa on 115 ratings points, but when the ratings are calculated beyond the decimal point, then they will be ranked number-one. A 5-0 sweep will mean India will take a two-point lead over South Africa.
India are now leading fourth-ranked Sri Lanka by two ratings points.
Even Sri Lanka have a fair chance of climbing up to No. 1 position in the table, but it would be a challenging task, as the Islanders will have to win all their five matches in order to achieve that, the ICC said in a statement.
If the visitors win the series by 4-1, then it will swap places with the reigning world champion.
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Meanwhile, India's captain for the first three ODIs against Sri Lanka, Virat Kohli will be aiming to regain the number-one ranking in the series, starting tomorrow in Cuttack.
The 25-year-old batsman is currently in third position in the ICC Player rankings for ODI batsmen, trailing number one ranked AB de Villiers of South Africa by 30 ratings points.
In the ODI bowlers' chart, India's left-arm spinner Ravindra Jadeja in sixth position is the highest-ranked bowler from either side. He will also be aiming to better his rankings.