"It will be important how we come back in our match against the West Indies (on Sunday) who will also be looking for points," said Moody.
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Sri Lanka, on the verge of defeat with South Africa needing four runs with five wickets intact on Wednesday, hit back through paceman Lasith Malinga's history-making four wickets off four balls before last man Robin Peterson hit the winning runs.
Malinga became the first bowler in one-day international cricket to grab four wickets off successive deliveries and fifth to achieve a hat-trick in World Cup history.
Earlier, Sri Lanka struggled to 209 all out with South African paceman Charl Langeveldt taking a career-best five for 39.
Moody said his team failed to keep the momentum of the first round where they won all their Group B matches -- including a crucial win over former champions India.
"It was not a bad defeat, but it's a defeat. I am disappointed the way we played.
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We did play well in the first 30 overs but against teams like South A