The left-hand opener counter-attacked brilliantly, driving and cutting with authority, and with a fine hand from Ajinkya Rahane (79 off 60 balls) he took the Indian total well beyond South Africa.
The Dhawan-Rahane stand was worth 125 in 16.3 overs.
Sunil Narine was silkily driven past cover and Roach pulled away for boundaries, and Marlon Samuels crashed backward of point.
A brief rain interruption was followed by Dhawan reaching his second ODI century with an uppercut six off Dwayne Bravo.
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One of the largest online dating apps for Sri Lanka singles on Facebook with over 25 million connected singles, First Met makes it fun and easy for mature adults in Sri Lanka to meet people.Dhawan rounded off a successful year - 960 runs at 48 - with his third century of 2017, and it was an effortless one in which he bullied Sri Lanka's bowlers from the start.The first of five ODIs in Sri Lanka got underway with India bowling out the hosts for 216 in 43.2 overs, which gave Dhawan the freedom to go hard in the chase.Meeting singles from Sri Lanka has never been easier.Welcome to the simplest online dating site to date, flirt, or just chat with Sri Lanka singles.