Play starts at 4:30pm on all courts
 Simona HALEP (ROU) vs. [4 / WC] Elina SVITOLINA (UKR)
 Angelique KERBER (GER) vs. Elise MERTENS (BEL)
Ons JABEUR (TUN) / Alison RISKE (USA) vs.  Anna-Lena GROENEFELD (GER) / Demi SCHUURS (NED)
CHAN Hao-ching (TPE) / Latisha CHAN (TPE) vs. Veronika KUDERMETOVA (RUS) / Jelena OSTAPENKO (LAT)
Elina Svitolina has a 4-2 head-to-head lead over former World No.1 Simona Halep. Svitolina has won their last three meetings, and in their most recent encounter, the Ukrainian dispatched Halep 6-0, 6-4 in the Rome final last year.
Win or lose, Halep's semifinal run is guaranteed to move her up from World No.3 to World No.2 in the new WTA singles rankings on Monday.
Angelique Kerber will meet Elise Mertens for the first time on Friday. Both World No.6 Kerber and World No.7 Svitolina have a chance to re-enter the Top 5 of the WTA rankings next week, but they would need at least a finalist showing to do so.
Halep is the only former Doha champion remaining in the field. She won the title in 2014 -- and she defeated Kerber in the final.
Ons Jabeur and Alison Riske were alternates into the field, but beat the No.1 seeds Nicole Melichar and Kveta Peschke in the first round en route to their semifinal showing.
This is the first event Veronika Kudermetova and Jelena Ostapenko are playing together. Kudermetova is seeking her first WTA doubles final, but has won four WTA 125K Series titles in doubles.
The Chan sisters, Latisha and Hao-ching, are having an excellent start to the 2019 season. They are 12-2 this year, winning the Hobart title, reaching the Brisbane final, and making the Australian Open quarterfinals.