Ospreys ended Bath's LV= Cup quarter-final hopes with a dramatic win at The Recreation Ground.
Hooker Matthew Dwyer went over late on and Sam Davies converted as Ospreys won 13-10.
Newport Gwent Dragons beat London Welsh 17-13 on Sunday to end the regions' involvement this season.
Cardiff Blues and Scarlets suffered heavy losses as their tournament pool stages ended.
Blues' hopes were dashed in a 43-9 home defeat by Leicester, who topped Pool 2, while Scarlets lost 38-3 at Sale in a dead rubber.
Neither Dragons nor the Welsh Exiles were challenging for knock-out spots in their encounter.