Play starts at 1pm
Lucie Safarova (CZE) / Barbora Stefkova (CZE) v Lesley Kerkhove (NED) / Lidziya Marozava (BLR)
Not before 3pm
Sofia Kenin (USA) v Tatjana Maria (GER)
Not before 5pm
Anastasija Sevastova (LAT)  v Samantha Stosur (AUS)
Sofia Kenin and Tatjana Maria have a win apiece from their two previous meetings. The American prevailed in Dothan last year while German Maria also won in 2017, in straight sets in Midland.
Anastasija Sevastova has won three of her five encounters with Samantha Stosur, including in Stuttgart last year and Brisbane earlier in 2018. The Australian's victories in Bad Gastein in 2015 and Doha in 2017 followed Sevastova's three-set win in their first meeting, in Beijing in 2010.
Samantha Stosur is yet to drop a set in Mallorca this week, while all three of the other semifinalists have been taken to three sets twice.
Tatjana Maria hopes to become the second successive German finalist in Mallorca, compatriot Julia Goerges having lost last year's showpiece.
Anastasija Sevastova has made the last two Mallorca finals, losing to Caroline Garcia in 2016 before triumphing against Julia Goerges 12 months later.