SCOTTSDALE, Ariz. -- When he underwent Tommy John surgery in 2009, Jarrod Parker knew he would have to rehab his right elbow.

What he's learned some 15 months later is that recovering from the procedure to remove the tendon from his left hamstring that the surgeon used to repair the elbow would take longer.

"It took longer to rehab from that than it did the elbow," said Parker, who was drafted by the D-backs in the first round of the 2007 First-Year Player Draft. "We're just strengthening it right now, building the strength and what not."

The leg does not bother him when he plants to pitch, but at times can bother him when he has to make quick sprints or agility-type drills.

While most people have the palmaris tendon of the forearm used to repair the elbow, about 14 percent of the population does not have one. Parker was one of those, so they used a tendon from his hamstring instead.

"Throwing wise, I feel good, and that's all that matters," Parker said.

Gibson in no rush to name Opening Day starter

SCOTTSDALE, Ariz. -- Kirk Gibson wants plenty of competition this spring, but one thing the D-backs manager does not view as a contest is who will start on Opening Day.

"I don't know if starting Opening Day is something to compete for," Gibson said. "I'm not sure what it does to be the first guy. I guess it is an honor. We're going to set our rotation up the way we think is best for our team. There's other things to consider."

Things like splitting up left-handers and not putting pitchers with similar styles back-to-back in the rotation.

As to who will be on the mound April 1 when the D-backs open against the Rockies at Coors Field, well, stay tuned.

"It's not even something we've talked about," Gibson said. "That's not something I'm focused on."

Gibson will start looking at how the rotation lines up following the club's lone off day of the spring on March 14.

"Until that point I'm not worried about it," Gibson said.