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Boult's overall record is good. But I remember a couple of occasions, when he conceded a lot of runs in the depth overs, resulting in Mumbai Indians losing the match. I agree that New Zealand is a dark horse, with star performers such as Boult, Jamieson and Ferguson. My main concern is that they may find the UAE conditions challenging. Also, one thing we need to remember is that the world cup will immediately start after the IPL. So those playing in the IPL may benefit from getting accustomed to the conditions. But then, most of the main players from New Zealand, Australia, West Indies and England will be taking part in the IPL.
Trent Boult might have given away runs once in a while but overall he is a much better bowler and he proved that multiple times playing for Mumbai Indians and if he could perform the same then he could trouble any batsman in any conditions, there are some outstanding players for New Zealand and when they are in form they can be unstoppable irrespective of the condition and England has players who have a strike rate above 100 in ODI and they can change the game as well, so you cannot underestimate these two teams because they are playing in spin wickets.
If you say these about Australia then i would accept because i am not expecting much from them in the upcoming World Cup.