Errani won their only previous meeting. That was in Bad Gastein in 2014. She won in straight sets on clay.
Clay stats for this year are better for Siniakova. Errani has had a poor season but had shown signs of improvement recently. In her last match though she had problems on serve again. FOUR times she went a break ahead in the 1st set but was broken immediately EVERY time. She was fortunate that Golubic aggravated an injury and Golubic faded badly in the 2nd set.
Siniakova has come through the qualifying rounds. She has been favourite in every match. She faced a couple of decent clay players in Soler espinosa and Cepelova and in the last round played Schmiedlova who seems ready to put her awful first half of the season behind her. Siniakova won that one in 3 sets.
I see value on Siniakova today but have a feeling Errani will scrape through again. Back her if she is broken first.