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It is not compulsory that the team batting first need to set a target of more than 180 runs in the final. T20 is unpredictable, the team that plays well will always win.
The team chasing is winning the matches in this World Cup and hence the team wining the toss will have an advantage and they will always look too chase the match rather than batting first as it is difficult to understand what a safe first innings score is in this wicket. It is difficult to bat in the first innings and as the match goes to the second phase it starts to help the batsman.