In the SWALEC Plate Rhydyfelin play Ystrad Rhondda at Taffs Well RFC in an all-Blues clash, while Cwmllynfell face Heol-y-Cyw for the other place in the Millennium Stadium Plate final.
The SWALEC Bowl semi-finals see Wattstown play Blaenavon at Cross Keys RFC and Cilfynydd play Fishguard & Goodwick at Loughor RFC. All Plate and Bowl semi-finals will take place at 2.30pm on Saturday 13 April.
Carmarthen Quins v Pontypridd at Aberavon RFC on Saturday 13th April at 2.30pm
Aberavon v Neath at Swansea RFC on Sunday 14th April, at 2.30pm
Tickets for the Cup semi-finals are £10 for adults, £5 for Under 16s and will be available from Saturday from the semi-finalist clubs.
Rhydyfelin v Ystrad Rhondda at Taffs Well RFC
Cwmllynfell v Heol y Cyw at Glynneath RFC
Wattstown v Blaenavon at Cross Keys RFC
Cilfynydd v Fishguard & Goodwick at Loughor RFC
All Plate and Bowl games kick off at 2:30pm on Saturday 13th April.