Halep or Kvitova and I suspect one of them will be #1 in the world after Indian Wells.
Osaka and Svitolina also have a chance. Osaka since she is the player to beat at the moment and Svitolina because I feel like this slow court would suit her game well.
Lol Osaka is not the player to beat, just look at her losses in the past year, she just crumbles to anyone who doesn't give her errors. She had to beat some injured Svitolina/Pliskova at AO and everyone acts like she beat Jesus.