New Zealand all-rounder Daryl Mitchell expressed his relief at crafting an important knock on Day 3 of the first Test against Sri Lanka in Christchurch. The right-hander admitted that it was especially special to do it in front of his family.Mitchell slammed the fifth century of his Test career as New Zealand roared back from 188-6 to post 373, taking an 18-run lead. The 31-year-old hammered 102 off 193 deliveries and shared two strong partnerships with the lower order. The 69-run stand between Neil Wagner and Matt Henry was the bedrock of their lower-order resistance.BLACKCAPS@BLACKCAPSA Hagley hundred! Daryl Mitchell's fifth Test hundred and first against Sri Lanka 🏏 #NZvSL79843A Hagley hundred! Daryl Mitchell's fifth Test hundred and first against Sri Lanka 🏏 #NZvSL https://t.co/pEiPNCTcDaSpeaking after the day's play, the all-rounder admitted that he never thought he would score even one Test ton and labeled himself as a late bloomer in international cricket.As quoted by ESPN Cricinfo, he stated:"To do it at home here in front of my family is pretty cool, and to do it in the circumstances where those runs were needed. I never knew if I would actually be able to get one Test hundred, let alone be where we are now. Every one is special. I guess I'm a late bloomer in international cricket. To represent my country across all the formats is something I've dreamed of since I was a kid."Despite the seam-bowling all-rounder falling with the team's score reading 291, the Kiwis didn't let Sri Lanka run away with a sizeable lead. Henry's 75-ball 72 played a massive part in the same."Thought the Sri Lankans bowled extremely well last night" - Daryl MitchellDaryl Mitchell. (Image Credits: Getty)Mitchell reflected that Sri Lanka used the conditions well, but that New Zealand's lower-order partnerships served them well enough. He added:"It's a typical Hagley wicket in that it has got pace and bounce there. I thought the Sri Lankans bowled extremely well last night. They built a lot of pressure and were relentless. You needed a little bit of luck to get through that patch as well. That was nice. And then to put on partnerships with the boys and get us to a total that put us ahead of the game was awesome."BLACKCAPS@BLACKCAPSThree wickets in the third session of Day 3. Blair Tickner (3-28) best with the ball at Hagley Oval. Catch up on the scores | on.nzc.nz/3IZM3xA #NZvSL14320Three wickets in the third session of Day 3. Blair Tickner (3-28) best with the ball at Hagley Oval. Catch up on the scores | on.nzc.nz/3IZM3xA 📲 #NZvSL https://t.co/7FGAeUKODfThe tourists now lead by 65 runs and will likely need to set the Kiwis nearly 300 to win. A Sri Lankan win would go a long way in sealing a spot in the WTC final.