STADIUM 1 -- 11:00 am start
 Kiki BERTENS (NED) vs  Garbiñe MUGURUZA (ESP)
Following 1 ATP match
Venus WILLIAMS (USA) vs Mona BARTHEL (GER)
Following 1 ATP match, not before 8:00 pm
 Aryna SABALENKA (BLR) vs  Angelique KERBER (GER)
STADIUM 2 -- 11:00 am start
Following 1 ATP match
Marketa VONDROUSOVA (CZE) vs  Simona HALEP (ROU)
Following 1 ATP match, not before 6:00 pm
 Naomi OSAKA (JPN) vs  Belinda BENCIC (SUI)
STADIUM 4 -- 11:00 am start
 WANG Qiang (CHN) vs [WC] Bianca ANDREESCU (CAN)
 HSIEH Su-Wei (TPE) / Barbora STRYCOVA (CZE) vs  CHAN Hao-Ching (TPE) / Latisha CHAN (TPE)
 Elina SVITOLINA (UKR) vs  Ashleigh BARTY (AUS)
 Anett KONTAVEIT (EST) vs  Karolina PLISKOVA (CZE)
STADIUM 6 -- 2:00 pm start
 Gabriela DABROWSKI (CAN) / XU Yifan (CHN)  vs Darija JURAK (CRO) / Raluca OLARU (ROU)
Naomi Osaka and Belinda Bencic have only played once before, at a Challenger event in Pelham, Alabama in 2013. Osaka won that match 6-3, 6-3, when they were both ranked outside the Top 400. Since then, both players have had stints in the Top 10 of the WTA rankings -- with Osaka being the current World No.1.
Osaka has now won nine consecutive matches at Indian Wells. She won her first WTA singles title at the BNP Paribas Open last year as an unseeded player.
In the only fourth-round meeting between Top 10 players, World No.8 and reigning Wimbledon champion Angelique Kerber will face World No.9 Aryna Sabalenka. This will be the first meeting between the two of them.
This will also be the first meeting between Simona Halep and Marketa Vondrousova, as well as between Wang Qiang and Bianca Andreescu. 18-year-old Andreescu and 19-year-old Vondrousova are the two teenagers who have reached the fourth round of this year's BNP Paribas Open.
Kiki Bertens leads Garbiñe Muguruza 3-1 in their head-to-head. However, all three of Bertens's wins came between 2010 and 2012. Muguruza won their only meeting since then, in the second round of Sydney last year. They were scheduled to play again in the same round of Sydney this year, but an ailing Muguruza gave Bertens a walkover.
Venus Williams has won all three of her meetings with Mona Barthel in straight sets. Their last clash came in the round of 16 of the 2017 Australian Open -- which is Barthel's only second-week appearance at a Grand Slam event to date.
Elina Svitolina has won all four of her matches against Ashleigh Barty. Their last match came in the round of 16 at the Miami Open last year, which Svitolina won 7-5, 6-4.
Karolina Pliskova won her only prior match with Anett Kontaveit. That came on clay in the semifinals of Stuttgart last year, en route to her first of the two titles she won in 2018.