A hat-trick from Mark Mepham helped Fen Ditton defeat Meldreth United 6-2, the other goals coming from Lee Northfield and two own goals.
Guilden Morden edged past Flying Pig in a seven goal thriller. securing a 4-3 win.
The Rock overcame Fowlmere Bostocks by 3 goals to 1.
There were more goals at Elmdon where a Daniel Davis hat-trick, a brace from Colin Finlay and a Sean Anderson goal helped the home team overcome Histon British Legion 6-2.
The Semi-Final draw will see The Rock entertain Guilden Morden and Fen Ditton host Elmdon Sunday.