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The main problem is Bangladesh is kind of in no form. They have their inside problem going on. Pakistan is surely the favorite here. And one of the main reasons why Bangladesh failed in the world cup is that they had no preparations for or the pitches that will be played in the world cup. They met their tracks suitable to themselves and that's why they failed so miserably.
The tracks that they prepared at Mirpur against New Zealand were pathetic. They were not of international quality. Bangladesh was able to sweep the series, since the inexperienced New Zealand batsmen couldn't handle the spinners in these tracks. But then they had to play the world cup matches in UAE and Oman, where the pitches were very flat. And this was when the Bangladeshi bowlers struggled to contain the batsmen. Remember that innings from Chris Greaves of Scotland?