The home team showed one change here on Sunday from their two-wicket win in the second match at Faisalabad as vice captain Younis Khan was forced to pull out after his brother died last week.
Younis's place was taken by prolific batsman Mohammad Yousuf, who missed the second One-dayer to be with his pregnant wife in Lahore.
The tourists showed no change as ace batsman Shivnarine Chanderpaul failed to recover from a knee injury, forcing him to miss the second match.
The first of the five-match series was washed out due to rain in Rawalpindi.
Pakistan: Inzamam-ul-Haq (capt), Imran Farhat, Mohammad Hafeez, Mohammad Yousuf, Shoaib Malik, Abdul Razzaq, Kamran Akmal, Rao Iftikhar, Rana Naved-ul-Hasan, Umar Gul, Abdul Rehman
West Indies: Brian Lara (capt), Chris Gayle, Lendl Simmons, Daren Ganga, Marlon Samuels, Runako Morton, Dwayne Smith, Denesh Ramdin, Ian Bradshaw, Corey Collymore, Jerome Taylor
Umpires: Nigel Llong (ENG), Asad Rauf (PAK), Television umpire: Zameer Haider (PAK)
Match referee: Alan Hurst (AUS)