Pakistan captain Misbah-ul-Haq rued his side's late order collapse in the first innings after Sri Lanka battled back to force a draw in the first Test in Abu Dhabi.
Pakistan crumbled from 327-4 to 383 all out after dismissing Sri Lanka for 204 and Angelo Mathews then led Sri Lanka's strong rally with a career-best 157 not out in seven-and-a-half hours.
That enabled Sri Lanka to declare on 480-5 to set Pakistan a victory target of 302 in 67 overs, but they eventually settled for a draw and ended up at 158-2.
"We should have got 450 runs on the board to put pressure on the opposition," Misbah said.
"We were batting well at one stage and instantly got all out, so this is one area which is not justified.
"If we had reached around of 170-180 in the second innings, then we could have pushed onward, but when Ahmed Shehzad got out then we thought we should go for the draw.
"Sri Lanka fought hard and batted well and I think this Test match ends up even-steven."
Mathews said: "I am really happy and hope I have justified my place in the team.
"We had six batters in the dressing room and we had to do the job. We knew we needed to put our hands up and try to get a big one.
"We had to make sure that we don't get to a losing position, we needed to get into a strong position to bowl them out.
"We knew the wicket wasn't doing that much so we needed some time to get them out as well, but we thought bat a few overs, get the 300-run mark, because in a couple of sessions it's not easy to score that 300."