An upbeat South Africa face West Indies in a virtual semi-final in the one-day international tri-series.

Australia have already booked their spot in the final, with South Africa second in the table ahead of Friday's clash.

The Windies are four points adrift, meaning a win would see them into the decider courtesy of more victories.

Both teams have won two of their five games heading into the encounter at Bridgetown.

South Africa bowling coach Charl Langeveldt said his team were positive heading into the clash.

"The mood has been great," he said.

"The two days off have given us a breather, conditions are warm here so if you practice every day you will get dehydrated and your energy will be low.

"Our big thing is to keep the energy levels high and to manage the players well.

"From a bowling point of view we are confident as an attack, especially the seamers."

Hashim Amla (225 runs) has enjoyed a good series with the bat, trailing only Marlon Samuels (252) for most runs.

But the conditions have suited the spinners, with Imran Tahir taking a series-leading 13 scalps.

Langeveldt has been happy with South Africa's displays with the ball, saying he had noticed development.

"We have had the odd blip with the no-balls but that’s cricket, you are going to get that," he said.

"The wides and no-balls have been a big improvement from the T20 World Cup where we were sloppy."

South Africa last completed a game in the series on June 15, when they thrashed the Windies, with rain ruining their meeting with Australia four days later.

The Windies won the series opener over South Africa by four wickets, before Tahir ripped through them in the second meeting.