Aberystwyth completed the semi-final line-up of the Loosemores Challenge Cup with a 2-0 win at Llanelli. First-half strikes from Stuart Roberts and Craig Jones gave the Seasiders the advantage at Stebonheath Park.
Cortez Belle pulled one back for the tournament favourites in the 49th minute, but it could not save the Reds.
Aberystwyth join Porthmadog, Rhyl and Caersws in the final four after their wins over The New Saints, Connah's Quay Nomads and Carmarthen last week.
A 91st-minute goal from Les Davies gave Porthmadog a shock 2-1 win at holders The New Saints.
Two Connah's Quay Nomads and one Lilywhite player were sent off at Rhyl, a Lee Hunt brace sending the home side into the semi-finals.
Graham Evans' 80th-minute goal for Caersws completed a 2-1 home comeback win over Carmarthen.