Rain threatens to postpone several fixtures of the first round of the Bert Bampton Cup this week.

Port Kembla was due to play Oak Flats Falcons on Monday night, but heavy falls around the Illawarra caused the match to be moved to Wednesday.

An assessment of the pitch will be made again before the match, but with more rain forecast it seems unlikely it will proceed.

Bulli and Helensburgh were due to meet Monday night at Rex Jackson Park and will have a similar pitch assessment later Tuesday.

The final fixture of the first round between Coniston Lions and South Coast United on Wednesday is also at risk.

Corrimal Rangers scored the upset of the round with a 3-0 win over Wollongong Olympic.

Elsewhere, Bellambi trashed Balgownie Rangers 7-1, Thirroul beat Warilla Wanderers 3-1 and Tarrawanna demolished University of Wollongong 8-1.