Marcin Bialoblocki still wears the An Post Rás yellow jersey following stage five of the race, with Belgian Moreno De Pauw taking the stage win in Mitchelstown.
De Pauw completed the 150km stage from Glengarrif to Mitchelstown in 3 hours 36 minutes 25 seconds.
An early attack by Michael Northey of Britain Node4 Giordana Racing and Seán Archbold, riding for An Post Chain Reaction Seán Kelly Team, was caught by Alexander Schrangl (Austria ARBO Gebruder Weiss) and Thomas Lavery (Waterford Comeragh), before all four were reeled back in by the bunch.
With just a few kilometres to go, the trio of Connor McConvey, riding for Azerbaijan Synergy Baku, Rasmus Guldhammer of Denmark Blue Water Cycling, and De Pauw made a break, with De Pauw edging the other two on the line.
Bialoblocki of Britain UK Youth Pro Cycling retains the race leader’s yellow jersey and will wear it for a third day on stage six.
He finished safely in the chasing group and leads the general classification from McConvey in second and Guldhammer in third, with all three on the same time.
Mehall Fitgerald of Tipperary visitnenagh.ie was the best county rider on the day, he finished 22nd.
Mike Cuming (Rapha Contador JLT) leads the king of the mountains standings, with Owain Doull and Simon Yates, both riding for the Great Britain National Team, retaining the points and under-23s jerseys respectively.
"I think I will have more points in points classification, and even if I don't have a time advantage on him, I will keep yellow anyway" - Marcin Bialoblocki
Rás leader Bialoblocki commented: "My team-mates, with another few teams, did all the work keeping it together to the end.
"The last few km was a bit harder, but still nothing serious. I'm very happy to keep yellow.
"My team-mates are great guys and give everything to help me."
Second in the GC is Irishman McConvey, who lies on the same time as Bialoblocki. However, the Pole feels confident that he can maintain control of the yellow jersey.
He said: "I think I will have more points in points classification, and even if I don't have a time advantage on him, I will keep yellow anyway."
"It could go down to the biggest day on paper on Saturday, or even to the sprint on Sunday, so we'll just play it by ear" - Connor McConvey
McConvey told the press: "Today was probably the easiest day of the race in terms of it being controlled.
"The Czech team rode in the beginning to keep it together for the two climbs to take the mountains points, and then the break went pretty quickly after that - only two guys so it was no big stress.
"Blue Water and UK Youth rode and it was controlled all day like a normal European race.
"The last 15km they brought the break back and there was only really 10-15km of racing, but that was enough to split it and do some real damage."
Regarding strategy for the remainder of the Rás, McConvey was coy, saying: "It will be more of the same: just stay in contention and take the opportunities when we get them.
"It could go down to the biggest day on paper on Saturday, or even to the sprint on Sunday, so we'll just play it by ear."
Stage six takes the peloton almost 155km from Mitchelstown to Carlow.
An Post Rás stage four: Glengarriff to Mitchelstown:
1 Moreno De Pauw (Belgium National Team) 3 hours 36 mins 25 secs
2 Rasmus Guldhammer (Denmark Blue Water Cycling) at 1 sec
3 Connor McConvey (Azerbaijan Synergy Baku)
4 Nicholas Vereecken (Belgium An Post Chain Reaction)
5 Benjamin Edmuller (Austria Arbo Gebrder Weiss)
6 Owain Doull (Great Britain National Team)
7 Rico Rogers (Azerbaijan Synergy Baku)
8 Dan Barry (Britain Node4 Giordana Racing)
9 Sam Bennett (Belgium An Post Chain Reaction)
10 Morten Oellegaard (Denmark Blue Water Cycling) all same time
Overall classification after five stages:
1 Marcin Bialoblocki (Britain Uk Youth Pro Cycling) 16 hours 41 mins 55 secs
2 Connor McConvey (Azerbaijan Synergy Baku)
3 Rasmus Guldhammer (Denmark Blue Water Cycling) both same time
4 Richard Handley (Britain Rapha Condor JLT) at 24 secs
5 Remi Pelletier-Roy (Canada National Team) same time
6 Daniel Foder (Denmark Blue Water Cycling) at 46 secs
7 Martin Hunal (Czech Republic Ac Sparta Praha) at 48 secs
8 Simon Yates (Great Britain National Team) at 52 secs
9 Roger Aiken (Louth Prague Charter Team) same time
10 Jasper De Buyst (Belgium National team) at 1 min 39 secs