Sakkari recorded a comfortable win over Marta Kostyuk in the round of 32 on Wednesday by a score of 6-4, 6-4.
Samsonova pulled off a massive upset in the round of 32 as she beat second seed Aryna Sabalenka 6-4, 2-6, 6-2.
Andreescu will take on Petra Kvitova in the last 32 after getting the better of Jil Teichmann 6-2, 6-4.
Tsitsipas recently participated in the Astana Open where he defeated the likes of Andrey Rublev and Hubert Hurkacz to make it through to the final.
The Austrian's form took a major dip over the course of the pandemic, dropping him to under the top 100 players in the world.
The WTA 1000 tournament will have Spanish tennis player and world no. 4 Paula Badosa as the top seed, followed by Aryna Sabalenka and Jessica Pegula.
The top seed is wildcard entry and world no. six Stefanos Tsitsipas. Tenth ranked player Cameron Norrie is seeded second.
Korda has faced Bautista Agut only once in the past and has come out on top 6-3, 7-6 (0) at last season's Halle Open.
Gauff and Andreescu have never faced one another before in competitive tennis, with the former has tasting more success this season.
The Spaniard was ousted in the very first round of the Ostrava Open after a 7-6 (7-4), 6-4 defeat to Petra Kvitova.