Pakistan defeated Canada by 46 runs in a low-scoring group A match of the World Cup in Colombo today.Brief Scores:Pakistan: 184 all out in 43 overs (Umar Akmal 48,Misbah-ul-Haq 37; Harvir Baidwan 3/35, Jimmy Hansra 2/23, Rizwan Cheema 2/33, Balaji Rao 2/50).Canada: 138 all out in 42.5 overs (Jimmy Hansra 43, Zubin Surkari 27; Shahid Afridi 5/23).