The Ospreys, who have been dominant at U18 and U20 level have lost only once at U16 level – 6-3 last time out to the leaders.

High Performance Manager Dai Arthur said, "If you look at the results, it's clear to see how competitive this age group is.

"We have a difficult game [on Wednesday night] but the coaches have prepared the side well and we are looking forward to getting ourselves back on track."

Blues South, however, will certainly not be a pushover. They too have lost only once this term, to the North, and are fresh from a victory last month over the Dragons.

Without a win from their two games this season, the Dragons entertain a Scarlets side who like their opponents have yet to register a victory.

They lost their opening game 24-12 to the North and followed up with a 16-12 defeat at the Ospreys. To stand any chance of reaching the final, neither side can afford to lose at the Recreation Ground, Tredegar.

Blues South: E Jones; I Mortimer, N Gumbleton, A Cooke, D Evans; D Bird, S Curtis; M Savery, J Deabrau, L Davies, R Tucker, T Connolly, J Wilson, R Fenton, D Crimmins

Replacements: J Tomlinson, J Gape, K Hopkins, M Buckler, J Lewis, D Lakin, T Luck
(Travelling Reserves: K Paylor, F White) 

Ospreys: T Prydie; B Davies, S Hughes, A Collins, E Walker; O Williams, R Jones (Capt); C Curtis, S Pick, D Saines, B Davies, S Treharne, R Apsee, M Sully, D Baker

Replacements: T Habberfield, M Morgan, B Barlow, R Thomas, L Evans, L Joseph, J Martin Fraser

Dragons: S Bevan; L Foley, M Jolly, A Herbert, A Cooper; D Carter, R Paul; L Ford, L Jones, A Yule, R Griffiths, R Wilson (Capt), G Hobbs, C Penna, G Evans

Replacements: J Evans, L Robling, L Smalley, G Ridgers, J Richardson, L Bacon

Scarlets: I Griffiths; T Ellis-Williams, D Ford, L Williams, J Russell; D Dafydd, A Davies; B Toms, G Isaac, S Lee, L Reynolds, L Hamilton (Capt), S Parry, M Dininno, K Myhill

Replacements: J Kaijacks, O Lloyd, R Evans, G O'Reilly, T Wiliams, S Charlton, R James, K Isaac