Pakistan, March 5 -- Shane Watson and Ahmad Shahzad hammered half centuries as Quetta Gladiators become the first team to qualify for the Pakistan Super League (PSL) play-offs with a comfortable eight-wicket win over arch-rivals Peshawar Zalmi at Abu Dhabi Stadium here on Monday. Watson smashed six sixes and as many boundaries in his undefeated 55-ball 91 not out while Shshzad cracked five boundaries in his 45-ball 50 as Quetta overhauled 166-run target in 17.4 overs. With the victory - their sixth in 12 games against Peshawar - Quetta qualified for the play-offs. They have with six wins in eight games and 12 points. Peshawar are second with ten points in eight matches, having won five and losing three. Islamabad United are third with fou...