Pakistan beat New Zealand by six wickets in the second day-night international in Abu Dhabi on Friday but the match was overshadowed by a worrying injury to opening batsman Imam-ul-Haq who was taken to hospital after being hit on the head by a short ball.
Imam, on 16, was forced to retire after a short delivery from fast bowler Lockie Ferguson hit the grille of his helmet, making him dizzy before he fell to the ground.
His eyes were closed but he did not lose consciousness.
Team management originally said that the 22-year-old would undergo CT scans and be monitored for the next 48 hours.
However, the Pakistan Cricket Board (PCB) later said that scans had shown that the player had suffered no damage.
Shaheen's 4-38 kept New Zealand down to 209-9 in their 50 overs before Zaman returned to form with a run-a-ball 88 for his seventh fifty to guide Pakistan to their target for the loss of four wickets in 40.3 overs. Veteran batsman Ross Taylor top-scored for New Zealand with a laborious 120-ball 86 not out and added 75 for the fifth wicket with Henry Nicholls, who made a gruelling 33 off 63 balls.
With the win Pakistan broke a four-year losing streak of 12 consecutive one-day internationals against the Black Caps, starting with a 3-2 defeat in the UAE in 2014. Undeterred by Imam's injury, Zaman added a quick 101 for the second wicket with Babar Azam who made a 50-ball 46 before both fell in the same Ferguson over. Sarfraz fell for 13 but Mohammad Hafeez hit the winning boundary to finish with 27 not out.
In his second spell, Shaheen yorked Tom Latham for one while Hafeez bowled George Worker for 28 to leave New Zealand struggling at 73-4.
Nicholls was finally bowled in the 38th over by Hasan Ali who finished with 2-59.