Pakistan captain Mohammad Rizwan flips the coin, and New Zealand's Mitchell Santner makes the call.
Pakistan win the toss and elect to bowl first.
'We've seen in the last couple of matches that the dew sets in later, so we want to maximise that advantage. As defending champions, there's some added pressure, but we'll approach it like we did in the previous tri-series. Also, Haris Rauf is fit again and back in the squad," said Pakistan skipper Mohammad Rizwan.
Kiwis skipper Mitch Santner said, 'The dew comes in later, but we have a job to do with the bat. It looks like a good wicket. We have a solid mix of experience and fresh talent and have been playing well. Having faced Pakistan both home and away, we know each other well. The key is adapting to conditions here in Karachi.'