Broomieknowe, represented this time around by Hannah Scott, Sandra Hennessey, Kate McIntosh and Katherine Anderson, opened their title defence with a 9&8 success against Musselburgh.
They now face Murrayfield tonight, when Baberton get the second round underway against Craigmillar Park.
Baberton have a strong-looking line-up in Karen Marshall, Fiona de Vries, Wendy Nicholson and Mandy Dougal.
And the home quartet overpowered Merchants 13&12 in recording the biggest first-round victory.
Dalmahoy, Murrayfield, Mortonhall and Liberton also progressed comfortably, with Craigmillar Park and Kingsknowe coming out on top against Newbattle and Glencorse respectively in the two closest encounters.
First round results
Baberton beat Merchants 13 & 12
Craigmillar Park beat Newbattle by 2 holes
Kingsknowe beat Glencorse 1 hole
Dalmahoy beat Prestonfield 7 & 6
Broomieknowe beat Musselburgh 9 & 8
Murrayfield beat Turnhouse 8 &7
Mortonhall beat Ratho Park 12 & 11
Liberton beat Royal Musselburgh 12 & 11
Baberton v Craigmillar Park
Kingsknowe v Dalmahoy
Broomieknowe v Murrayfield
Mortonhall v Liberton