Shane Watson has been part of PSL 4 profitable group Quetta Gladiators led by Sarfraz Ahmed (Photograph: File) Karachi: Former Australian all-rounder Shane Watson has been appointed as the brand new coach of Quetta Gladiators. Quetta Gladiators proprietor Nadeem Umar, group director Moin Khan and group administration have appointed former Australian all-rounder Shane Watson because the coach of Quetta Gladiators…