The tall Centurion local got off to a blazing start and birdied three in a row from the fourth to the sixth, but two bogeys just before the turn made it an open case for the part-time law student.
It looked like things were steadying out when Roos made birdie at the 12th, but a drop on the following hole was the first thread as the round began to unravel.
A further bogey at the 14th led to a double bogey six at the 16th and set Roos back by some distance, but he managed to reach the clubhouse in two-over-par 73.
A halfway total of one-under-par earned the 33-year-old a trip to the weekend, but he’ll need to come out firing in order to gain ground on leader Mikko Ilonen, who set the 36-hole pace at 10-under.
Darren Fichardt scraped through to the weekend after carding three-over-par 74 on Friday, which set him into a share of 63rd alongside Justin Walters. The two South Africans are experienced enough to know how to tackle the weekend and will surely make a good rise over the following two days.
Roos is new to European contention and every good round, every weekend made is a treat. While bogey slips crippled his charge on two occasions during the second round, there is no doubt that he is scoring well when the opportunity arises.
He’ll look to eliminate the mistakes and card two solid, sub-par rounds this weekend in Ireland and consolidate for a good tournament result.