Sri Lanka captain Kumar Sangakkara has described his early success as "worrying" as it has raised expectations of the team.

Sangakkara was appointed captain in March this year, taking over from Mahela Jayawardene who stepped down following the abandoned two-Test series in Pakistan.

As captain, Sangakkara has already achieved tremendous success by leading the team to the final of the World Twenty20 in his first assignment and securing Sri Lanka's first ever Test series victory over Pakistan at home.

But Sangakkara said: "The start is worrying and I only hope it continues to get better.

"It's true that you've got to enjoy the good times, but you also need to make sure that the team is prepared to face the bad times.

"You have got to make sure that the bad times don't last long.

"It's going to get a lot tougher as the years go by, but we have got the ability to get better and the amount of work we do on the field and off the field with our focus on cricket is going to be the key," he said.

Sri Lanka took an unassailable 2-0 lead in the three-Test series against Pakistan by winning the second Test in Colombo by seven wickets.

At 285 for one, Pakistan had been in a dominant position in the morning session, but collapsed to 320 all out just after lunch, which left Sri Lanka with a target of 171 for victory.

Sangakkara savours speical win

Sangakkara's gamble of handing the new ball to left-arm spinner Rangana Herath paid off with the spinner triggering the collapse with a four-wicket haul.

Herath, a late inclusion in the team due to injury to Muttiah Muralitharan, finished with career-best figures of five for 99 and was well assisted by fast bowler Nuwan Kulasekara, who finished with four for 37.

"Pakistan were in such a position they could have dominated," Sangakkara said.

"We walked onto the ground wondering what to do with the new ball and I tossed the ball to Rangana and he picked up Mohammad Yousuf off the first over once again.

"We needed someone to stand up and luckily we had two guys doing the job for us in Nuwan (Kulasekara) and Rangana."

Sangakkara, however, was displeased with the batting.

"We are mindful of the fact that we should have batted them out of the Test in the first innings," he said.

"We have a lot of work to do with our batting."