Left-handers Danny Duffy and Jason Vargas, and right-handers Edinson Volquez and Jeremy Guthrie, all will throw 90-95 pitches in their next starts before being backed down to 60-65 in their final tune-ups before the regular season.
Duffy will stay in Arizona on Thursday when the rest of the team travels to Houston for exhibition games on Friday, April 3 and Saturday, April 4. Duffy will throw a simulated game here in Surprise.
Volquez and Vargas are scheduled to start in Houston, while Guthrie likely will throw a simulated game in Kansas City on Sunday, April 5, a day before the regular season opener.
Jeffrey Flanagan is a reporter for MLB.com. Follow him on Twitter at @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.