India's status as the No.1 Test side in ICC rankings will remain intact irrespective of how the series against South Africa pans out, but the Proteas will join the visitors at the top if they win all the three matches. Faf du Plessis's side is presently 13 points behind Virat Kohli's team, which is sitting on top of the table on 124 points.
However, both the sides will finish on 118 points if the South Africa side makes a clean sweep of the series which starts in Cape Town on January 5.
In such a situation, India will be on 118.47 points, while South Africa will be on 117.53. On the other side of the coin, if India win all the three Tests of the series, then they will move to 128 points while South Africa will slip to 107 points.