In World Cup Cricket Ireland will face their biggest challenge when they clash against South Africa in a Pool-B match in Canberra.With victories over the West Indies and UAE, Ireland have so far proved that they are no pushovers but their dreams of making it to the knockout stage will face a tough test against South Africa.Pre-tournament favourites South Africa's 257-run win against the West Indies has boosted their campaign after their stunning 130-run loss to defending champion India a week ago.