For sat-nav users, the best postcode to use is CF32 0LS rather than CF32 0LR. CF32 0LS is more likely to direct you along Merthyr Mawr Road and past the lawns. The problem with CF32 0LR is that it is likely to direct you to the house via New Inn Road and the Dipping Bridge.
If you are approaching along Merthyr Mawr Road from the Bridgend side then the car park is just before the lawns and the club house, ie near the ‘ma’ in Merthyrmawr Road in the above map. You need to go through the wooden gate (which may be closed).
Alternatively put Merthyr Mawr Tennis Club into Google maps.