The Proteas, one of the strong contenders, conceded 26 extras against England including 20 wides while defending 229 for four, and eventually lost. Against the Caribbeans, they could not defend 122, losing the match in the last over having conceded 10 extras that had eight wides.
Du Plessis said even as "T20 cricket is sometimes a gamble", there are a few things that teams can control.
"It's your job is to try and get the ball inside that line and if you do it less than the opposition, it's generally five and 10 runs that you don't have to score with the bat. That's possibly the key area for me in the first two games that we lost," he added.
"Tonight was a good example, Sri Lanka made one or two mistakes while batting and we capitalised on that. We have only to blame ourselves. The sad thing now is that it's four years for the next World Cup," he rued.
Sri Lanka posted 120 that South Africa achieved in 17.4 overs but Du Plessis termed the low-scoring chase as "tricky".
"We came here with a great squad, wanting to win the World Cup. We didn't play our best cricket. That's not how we wanted to go. We have only ourselves to blame. We were planning to do much better. But we're a proud team.
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