India and South Africa are gearing up for three Test match series, starting October 2. After the T20I series which ended 1-1, the focus shifts towards the longest format with the series being a part of the ICC World Test Championship. Both teams will look to strong start and be guided by their key players. Here are the players to watch out for. After being promoted as an opener, Rohit Sharma took white-ball cricket by storm, however, his Test career never managed to take off. He has been warming the bench and this is a big opportunity. The management has backed Rohit to open the innings. His application against the moving ball will be key. It is a new challenge for Rohit. Can he deliver the goods? With Jasprit Bumrah ruled out of the series, the role of Ishant Sharma gets decisive. The senior pacer has done a superb job for a while now and is the side's perfect leader. In the spin department, all eyes will be on an in-form R Ashwin. He was benched for the series against Windies and Ashwin will be raring to make his presence felt. With 176 wickets in 37 Tests, Kagiso Rabada is one of the best in business. He is a strong-headed fast bowler that has all the credentials to shine. With an average of 21.77, Rabada will test the Indian top order with his variations. He can get you those early wickets and put pressure. Also, he forms an excellent partnership with Vernon Philander. South Africa will be bolstered by the presence of their skipper Faf du Plessis. He is their main bet with the bat. Faf will need to show his attributes and have a strong influence. SA need him to fire and score the bulk of runs. He is a good player of spin and the need of the hour will be proper application.