This will be the first time they have played.
Estrella has the better record on clay. He had a 3 set win in the last round over Kukushkin. He started a little slowly and was helped in the end by Kukushkin not being 100% fit.
Chardy can raise his game on clay for bigger events and reached the 4th round at the French Open last year. He has been a little inconsistent in 2016.
I think we will see a higher price on Chardy but the ultimate outcome will depend on whether Chardy can continue his form from last week where he took Bautista Agut to 3 sets.
Value on Estrella at the start. I think Chardy wins in 3 sets.