The flagship daughter of stallion Derryn overcame a slow start to finish runner-up in the Listed Ryder Stakes (1200m) at Te Rapa in her final two-year-old outing to give Sharrock confidence she will handle a rise in distance.
Lisa Allpress rode Sophmaze in all her starts last season and will continue her association on Saturday.
"I don't think the 1340m will be any boundary for her. We will just ride her a bit cold early on," Sharrock said.
Sophmaze was a touch ordinary on the track earlier this week before dispelling any concerns the next time she stretched her legs.
"I wasn't disappointed, but she was a bit lax in her work on Tuesday. We breezed her up this morning and she worked very well so I think she has to be the hardest to beat in the Guineas," Sharrock said.
Librarsi didn't waste any time showing her talent last season with a debut victory at Ōtaki where she raced on the pace and lengthened stride impressively for a dominant display.
She then finished a meritorious sixth in the Ryder Stakes after enduring a tough run from the outside barrier and Sharrock has no concern about the underfoot conditions.
"The track will be no issue and she won on an off track first-up and she only got beaten by 2.6 lengths in the Ryder at Te Rapa, so second-up it was a good run," he said.
"The draw didn't help and she was a sitting duck a fair way out and, all in all, I'm pretty happy with her."
Craig Grylls has been aboard in both runs and he will again take the reins at Whanganui where the filly will be sporting a new look.
"I've put blinkers on her on Saturday and looking at her work she is going to take a bit of beating, she went super," Sharrock said.
While Librarsi is sharp enough to be competitive over 1200m in the Fillies' Classic, she is expected to make her future mark over more ground.
"I think the Eulogy Stakes [Group 3, 1600m] will be a nice race for her, she will get a mile being by Reliable Man," Sharrock said.
"I just want to tick off getting some black-type with her and hopefully she can do that on Saturday."
- NZ Racing Desk
RACE OF THE WEEK
RACE 7 AT TE RAPA, 1200m
$40,000, Sunday, 3.10pm
The race: A trio of Group 1 winners and some promising lower grade horses looking to take the next step.
Classic performers: The last two NZ Oaks winners Amarelinha and Belle En Rouge both resume against former Karaka Million winner On The Bubbles.
The money: It will be tough for the bookies to line up, as the Te Akau horses always take money but the top two have plenty of weight.
Support card: The Te Rapa meeting also hosts the Pakuranga Hunt Hurdles and Steeples, the major lead-ups to the Great Northern in two weeks.
The quote: "Miss Cartier is flying and has been great in her two trials so, with the side winkers on, is the best of mine." - Stephen Marsh, trainer.
The verdict: The 1200m is short of Belle En Rouge's best but she beat La Crique over 1300m this time last year. The weights suggest she can win.