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Kolkata: Ireland skipper William Porterfield won the toss and decided to field against South Africa in their World Cup Group B match at the Eden Gardens on Tuesday.
Ireland have been the most impressive of the non-Test nations, pulling off a shock win over England and testing favourites India and the West Indies before losing.
South Africa, with six points from four games, will be assured of a place in the last eight with a victory while Ireland, with two points from four matches, only have a slim chance of qualifying.
The momentum is currently with South Africa who bounced back strongly to defeat India by three wickets in a tense finish in Nagpur on Saturday after losing a close match to England.
South Africa have shown they have depth in both bowling and batting. Their spinners, Imran Tahir, Robin Peterson and Johan Botha, were superbly backed by pacemen Dale Steyn and Morne Morkel in previous games.
The Pakistan-born leg-spinner Tahir, with 11 wickets in three matches, missed the last game due to a fractured left thumb and South Africa have to decide whether to play him against Ireland.
South Africa's batting looked solid against India, especially after Jacques Kallis's return to form with a 69 in Nagpur after contributing just 21 in the first three matches.
Ireland not only made India battle for victory with their gritty display, but also gave a scare or two to the West Indies before losing by 44 runs in Mohali.
Ireland are sweating over the fitness of in-form paceman Trent Johnston who suffered a knee injury against India.
Johnston, who missed the last match, is his team's second-highest wicket-taker with six in three games.
