D-backs undecided on pitching order for doubleheader

PHOENIX -- D-backs manager Kirk Gibson knows Trevor Cahill and Ian Kennedy will both pitch in Monday's split doubleheader against the Rangers, he just isn't sure who will start the day game and who will start the nightcap.

"I don't know what order they'll be in," Gibson said. "We've had some conversations about it but I don't have it right now."

Kennedy last pitched on Tuesday so he will be on six days' rest Monday while Cahill's last outing came on Wednesday, so he'll still be on his normal schedule thanks to Thursday's off-day.

For the Rangers, they've already established that left-hander Martin Perez will work the first game and staff ace Yu Darvish will take the mound in the evening.