India now appear set for a berth in the quarterfinals after their two comprehensive wins over Pakistan and South Africa which places them on top of Group B. They have yet to play the only other team of substance, the West Indies, with the remainder of the group being made up of Ireland, Zimbabwe and UAE.
Dhawan's career-best 137 propelled India to a comfortable 307 for seven today before the bowlers performed brilliantly to bundle out the Proteas for 177 in 40.2 overs in what turned out to be a rather lopsided contest at the packed Melbourne Cricket Ground.
With two wins from as many matches, India now have a very good chance of qualifying for the quarterfinals as group leaders.
It was yet another commendable show by the Indians, who came into the tournament with a string of poor results in the tri-series preceding the mega-event.
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Mohit Sharma (2/31 in 7 overs), Ravichandran Ashwin (3/41 in 10 overs) and Mohammed Shami (2/30 in 8 overs) kept the opposition batsmen under tight leash for better part of the innings.
De Villiers and Du Plessis were going strong at one stage adding 68 runs for the third wicket as South Africa reached 108 for two before the skipper got run-out.
Du Plessis (55) tried his best to stem the rot but once he mistimed a pull-shot off Mohit to Dhawan at covers, it was just a mere formality for the 'Men In Blue', who hardly put a foot wrong in front of the 86,786 crowd of which at least 75,000 were Indian supporters.