Itinerary Seville, Ronda, Malaga, Madrid

You missed amazing Toledo, just outside Madrid. Also, Segovia.
Be sure to fit in a day trip to both cities.

I'd also want to see Cordoba (rather than Ronda or even Malaga, if necessary), but tastes vary. It is nice to have the coastal stop (Malaga) in there.

We have already been to Toledo and Cordova and Grenada.

Mostly wondering about the drive from Seville to Malaga - easy? What are must sees?

We have at least a few people here who've driven to some of the white villages. I have not, though I've been to Ronda, Grazalema and Arcos de la Frontera by public transportation. You might try the Search function (specifying Travel Forum on the initial results screen) for the following town names:

Arcos de la Frontera (farthest from Ronda)
Grazalema
Zahara de la Sierra
Setenil de las Bodegas

Many of the roads in that area are narrow and curvy, so I don't know how many places you'll be able to see, given your limited time--just one day between Seville and Malaga with an overnight planned in Ronda. ViaMichelin.com is useful for routings by car, and if you zoom way in on its maps, the most scenic roads will be outlined in green.

The drive is an easy one. Traffic will be light once outside of Sevilla. The roads will be in good repair, mostly 2-lanes, with speed limits about 70kph/42mph in many areas. Going through the hilly areas there are plenty of twists and turns.

Places one could visit en route depending on the route you’d take include Olvera and its castle, Setenil de las Bodegas with houses and shops built into the hillside, Caminito Del Rey walk if you have plenty of time, Antequera and its dolmens, Cascada de la Caldera, Arcos de la Frontera, El Torcal de Antequera, and Zahara de la Sierra.

Where you stop and for how long will be determined by the time you’ve allotted.