Faf du Plessis said South Africa "have been going at 60 per cent" and must raise their game in the World Twenty20.
Faf du Plessis knows South Africa must "step it up a gear" as they prepare for a crunch World Twenty20 clash against West Indies on Friday.
The Springboks started their World T20 campaign by losing to England in a run-fest last week, but responded with a defeat of Afghanistan.
South Africa could replace the Windies, who have won two out of two in India, at the top of Group 1 with a victory in Nagpur.
And T20 captain Du Plessis said there is plenty more to come from his side ahead of the match against the in-form Windies, with a final Group 1 game against Sri Lanka to come next Monday.
"You can't come here thinking any match is going to be easy," he said. "Afghanistan was a difficult game for us, I still think that they can beat someone in this tournament.
"We would have liked to start that first match with a win after posting 230 but it didn't work out that way. We know that we have to play our best cricket leading up to the semi-finals.
"It’s a nice boat to be in. You have to peak at the right time, that is when you win tournaments.
"As a team we have been going at 60 per cent for a while and I'm hoping we'll step it up a gear as we head into the crunch matches."