New Delhi: India trounced South Africa by 6 wickets in the series opener to take a 1-0 lead in the six-match rubber and the Indian skipper Virat Kohli believes this win will boost the confidence in Indian camp and will set the momentum in the remaining matches.

"First match of the series is important. We wanted to take the momentum of the (third) Test win into this and when we restricted South Africa to 270 on this sort of a pitch, we were happy," Kohli, who hit 112 of 119 balls for his first ODI hundred in South Africa, said after the match.

Having backed Ajinkya Rahane before the opening encounter for the No.4 spot in Indian batting order, Virat praised Rahane for his brilliamt 79 of 86 balls with whom he shared 189 runs for the third wicket.

"Jinx (Rahane) is a top class player. We understood fast bowling was going to be a big factor in this tour. He was superb, he took on the fast bowlers," said Kohli who was adjudged man of the match.

On the performance of his bowlers, Kohli said, "Bhuvi and Bumrah, we bank on them. Picking up one or two wickets in the top ten is what we wanted to do.

"And then the two wrist-spinners (Kuldeep Yadav and Yuzvendra Chahal), outstanding bowling by both of them. They are working wonderfully for the team. They're playing in South Africa for the first time. They were very brave, they were throwing it up and that's why they got wickets.

"As a captain, it's outstanding when you have two guys who know what they want to do."

South Africa captain Faf du Plessis said he was disappointed for his side's batting show.

"Definitely, we did not score enough, we did not bat well enough. I reckon we were about 50-60-70 runs short. Chris had a good partnership but as a batting unit we were disappointed," he said.

"When you're chasing five runs an over here, it's pretty easy. We tried everything with field placements and tactics but Virat and Rahane played very well."

Asked if he had suffered any injury while fielding, du Plessis said, "Just a few battle scars. Just went upstairs to get the fingers checked. One-day cricket the intensity is a lot higher. Happy to go through the game. Feeling strong."