Texas Rangers ace Yu Darvish threw off flat ground up to 100 feet on Saturday at Globe Life Park in Arlington and also threw 30 pitches off flat ground. He's scheduled to throw on Sunday, but it's unclear exactly what that will entail.

Darvish will officially go on the disabled list on Sunday. It will be backdated, so the first day he's eligible to come off it is April 5.

Saturday was the first time Darvish, who has been dealing with a stiff neck for more than a week, has thrown since trying to play catch on Monday.

Darvish was scratched from his Opening Day start after experiencing neck stiffness near the end of spring training. He thought it would go away after a few days, but it didn't and the decision was made to be sure everything was OK and then ramp him up again. An MRI on Wednesday showed no structural damage.