Tillakaratne Dilshan and Kumar Sangakkara struck fluent centuries as the Sri Lankan top order punished Pakistan's wayward bowlers on the opening day of the first test on Friday. Dilshan (101) scored his 13th test century and Sangakkara remained unbeaten after his 29th to power Sri Lanka to 300 for two wickets at stumps and vindicate skipper Mahela Jayawardene's decision to bat first. Sangakkara, who has an 80-plus batting average against Pakistan, was unbeaten on 111 scored off 194 balls with the help of 13 fours. He added 113 runs for the third wicket with Jayawardene, who was unbeaten on 55, having survived a strong leg before appeal at 21 off Umar Gul.