ANN JONES CENTRE COURT -- Not Before 11:30 a.m.
Dayana YASTREMSKA (UKR) vs.  Julia GOERGES (GER)
 Naomi OSAKA (JPN) vs. Maria SAKKARI (GRE)
[WC] Venus WILLIAMS (USA) vs. Aliaksandra SASNOVICH (BLR)
Donna VEKIC (CRO) vs.  Ashleigh BARTY (AUS)
COURT 1 -- 11:30 am start
Ekaterina ALEXANDROVA (RUS) vs. Petra MARTIC (CRO)
Jelena OSTAPENKO (LAT) vs. [Q] Iga SWIATEK (POL)
[WC] Harriet DART (GBR) vs. Yulia PUTINTSEVA (KAZ)
 WANG Qiang (CHN) vs. [Q] Lauren DAVIS (USA)
Jennifer BRADY (USA) vs. Lesia TSURENKO (UKR)
COURT 2 -- 11:30 am start
Darija JURAK (CRO) / Katarina SREBOTNIK (SLO) vs.  HSIEH Su-wei / Barbora STRYCOVA (CZE)
[Q] Kristyna PLISKOVA (CZE) vs. [Q] Viktoriya TOMOVA (BUL)
Mihaela BUZARNESCU (ROU) / Heather WATSON (GBR) vs. Raquel ATAWO (USA) / Lyudmyla KICHENOK (UKR)
Alicja ROSOLSKA (POL) / YANG Zhaoxuan (CHN) /  Nicole MELICHAR (USA) / Kveta PESCHKE (CZE)
 Anna-Lena GROENEFELD (GER) / Demi SCHUURS (NED) vs. Latisha CHAN (TPE) / CHAN Hao-ching (TPE)
WTA World No.1 Naomi Osaka will play her first grass court match since losing to Angelique Kerber in the third round of Wimbledon last July.
She has a 1-1 career head-to-head record with Maria Sakkari, who took the honors when the pair met last, in Cincinnati 2018. Both their previous encounters have been on hard courts.
Julia Goerges was made to work hard for a three-set victory over Danaya Yastremska in their only previous match. That 6-4, 3-6, 6-4 victory came in New Haven.
Venus Williams is appearing at the Nature Valley Classic for the first time. She is the only previous Wimbledon champion in the field.
Donna Vekic and French Open champion Ashleigh Barty are the only two players in action on Tuesday to get to the final of this tournament previously. Both were runners-up, Vekic in 2013 and Barty in 2017.
The WTA World No.2 has never previously met the Croat in a Tour-level match.
Jelena Ostapenko is seeking to put a poor claycourt stint behind her. She finished with a 3-6 losing record on the dirt this year.
Of Iga Swiatek's last 23 sets played in singles competition, 18 have ended 6-0 or 6-3. In her four French Open matches, there was a bagel set either for or against her.
Lauren Davis won her only previous match against Wang Qiang, on the hard courts of Doha in 2017 qualifying.