Starting at 12:30pm
Andrea SESTINI HLAVACKOVA (CZE) / Barbora STRYCOVA (CZE)  v Alicja ROSOLSKA (POL) / Abigail SPEARS (USA)
Not before 3pm
Aryna SABALENKA (BLR) v Julia GOERGES (GER) 
Not before 7pm
Carla SUÁREZ NAVARRO (ESP) v [Q] Monica PUIG (PUR)
A hot and sunny day is in store for New Haven.
No.5 seed Julia Goerges is chasing her second WTA Tour title of 2018. Her previous success came on Auckland's hard courts in January.
Her semifinal opponent Aryna Sabalenka has won the only previous meeting between the pair. The WTA World No.25 claimed the honors in a last-32 clash in Eastbourne on grass, 1-6, 6-4, 6-4.
The Belarusian is a rapidly rising star, but she has only one win in her previous five matches against Top 10 players. Coincidentally, that also came at Eastbourne, where she beat Karolina Pliskova en route to losing the final against Caroline Wozniacki. Goerges is currently WTA World No.9.
Goerges has won only two of her last six matches against opponents from Belarus. Of these encounters, she was the lower-ranked player on one occasion.
Carla Suárez Navarro has a 4-1 head-to-head advantage over Monica Puig. On hard courts, the Spaniard holds a 2-0 advantage, although the last meeting between the pair was in 2015.
Puig's last semifinal was in Luxembourg last year. She defeated Elise Mertens in straight sets but lost to Carina Witthoeft in the final. Suárez Navarro's previous venture into the final four of a tournament was on the clay of Bucharest in July 2017.
Regardless of which semifinalist goes on to win the tournament, they will be the first woman from their nation to do so since it was moved to New Haven in 1998.