"There is no doubt that when you get to the knockout stages you want to be the guy to score the big runs to put the team in a good position," Amla said at the squad's training session held in Blacktown, here today.
"Everybody in the team, especially the senior guys, want to be the guys to make the big plays for us; with the bat, ball and in the field," he added.
"We are well aware that we haven't won a knockout game and that serves as good motivation for the guys to make it a first for South African cricket.
"The Proteas will have to curb Sri Lanka's X-factor players in Kumar Sangakkara and Lasith Malinga, opponents they have faced several times over the last two years. They (Sri Lanka) are a wonderful team, they compete very well at World Cups," Amla said.
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"They seem to be playing good cricket. Thankfully we have played them in the recent past, both teams know each other well. A one-off game like this will be played with good intensity, it's going to be a good game," he added.
"We have been fortunate that we were at home for the build-up of this tournament. We came to New Zealand and Australia for a tour, went back home for a month-and-a-half then came back here.
"Most of the guys are fresh, some of the other teams have been away from home for a long time, and thankfully we are fresh and keen to make a good play on Wednesday.