KOLKATA (Agencies) - Sourav Ganguly feels it will be a very open World Cup and tips India, Australia, Sri Lanka and South Africa to make the last-four stage, with Pakistan being his dark horse. Sourav analyses the teams in a chat with Sumit Mukherjee. India Strength: A powerful batting line-up, stacked with match-winners, and plenty of variation in bowling. Weakness: There is no one who can bowl genuinely quick, so Indian bowlers will have to mainly rely on clever variation to prevent rival batsmen from hitting through the line. Ground fielding is an area of concern. Opportunity: It's India's last big chance to win the Cup before the rebuilding process starts. I expect the team to play around Sachin Tendulkar and make it a memorable event for the maestro. Threat: Much will depend on how individual players, and the team as a whole, handle the pressure of expectations of a billion fans. AUSTRALIA Strength: Good and robust batting side a potent pace attack with two genuine quick bowlers in Brett Lee and Shaun Tait. Michael Johnson or Steven Smith likely to bat at No 8, the Aussies have enough depth in their batting. Weakness: Lack of a quality spin bowler is sure to hurt them at some stage of the tournament. Jason Krejza is a decent bowler, but, against quality players of spin bowling, he may struggle. Opportunity: They have a golden opportunity to make it four-in-a-row. Ponting, having led Australia to two successive World Cup titles, now has a chance to record a hat-trick. Threat: The threat to Aussies comes mainly from the sub-continental teams like India, Sri Lanka and Pakistan as these teams not only have better spinners, but also players. SOUTH AFRICA Strength: A great pace bowling unit and a strong batting line-up. They also have three spinners which means skipper Graeme Smith has sought to cover all the bases. Dale Steyn and Morne Morkel are genuinely quick and are capable to extracting good bounce from deadest of tracks. Weakness: They have too long a tail. With Du Plessis at No 7 and Johan Botha at No 8. Opportunity: The Proteas have always been a very competitive side. They haven't gone beyond the semis in World Cup so it gives Smith's side an added desire to take those final two steps to glory. Threat: The Proteas have always been extremely vulnerable to quality spin bowling and would be wary of teams like India, Pakistan and Sri Lanka. SRI LANKA Strength: Top-order batting and a quality attack with lots of variety in both, pace and spin departments. With Tharanga, Dilshan, Sangakkara and Jayawardene at the top of the order and the likes of Murali, Mendis, Malinga and Perera forming the core of their bowling attack. Weakness: An untested middle-order. Should Sri Lanka lose early wickets, it will expose a middle-order comprising Samaraweera, Kapugedera, Chamara Silva and Angelo Mathews. PAKISTAN Strength: A slew of big-hitters and a potent pace attack make Pakistan a dangerous side, which is known to play fearless cricket. They bat deep with someone like Razzaq at No 8. In Gul and Akhtar they have two fast bowlers who can devastate any line-up and Ajmal and Rehman they have two crafty spinners. Threat: They have the tendency to self-destruct, so the threat perception for Pakistan comes from within this extremely talented bunch of individuals.