Sri Lanka's opener Kaushal Silva frustrated Pakistan with an unbeaten 80 when the rain-hit first Test finally got underway on the scheduled second day in Galle today.
Veteran Kumar Sangakkara chipped in with 50 to leave the hosts on 178 for three at stumps after Pakistan captain Misbah-ul Haq elected to field first on an easy-paced pitch.
After inclement weather had washed out the entire first day's play on Wednesday, just 64 overs were bowled on the second day after a wet outfield delayed the start by two hours at the Galle International Stadium.
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Karunaratne attempted to pull a short ball, but only managed to edge a catch to wicket-keeper Sarfraz Ahmed to provide the tourists a much-needed breakthrough.
Silva and Sangakkara teamed up to add 112 runs for the second wicket, batting through the post-lunch session to take their team to a comfortable 123 for one by tea.
Sangakkara, Test cricket's current leading run-getter who is expected to retire during the home series against India in August, hit two boundaries and a six.
The prolific left-hander, who took a break from his English county commitments with Surrey to play for his nation, began ominously by driving his first delivery from Wahab to the mid-on fence.
But he fell soon after reaching his 52nd half-century when he edged a drive off Wahab to Younis Khan in the slip region.
Pakistan could have removed Sangakkara when he was on 24, but Azhar Ali at short-leg spilled a sharp chance off leg-spinner Yasir Shah.
The tourists struck again soon after as Lahiru Thirimanne, who scored eight, drove Mohammad Hafeez uppishly to mid-on where Zulfiqar Babar held the catch after juggling with the ball.