Daniel Hudson and Matt Reynolds recover from Tommy John surgery.

PHOENIX -- Daniel Hudson and Matt Reynolds, both of whom are recovering from Tommy John surgery last year, each threw a bullpen session Tuesday morning.

For Hudson, it was a continuation of the bullpen sessions he has already been throwing. For Reynolds, though, it was the first time he had thrown off a mound since his surgery last September.

"He looks good, he looks strong, he looks comfortable on the mound," D-backs manager Kirk Gibson said. "Feels good about it. He looks good, his mechanics are good. I think they cleaned it up a little bit, made it a little shorter, made it a little less rotational, tried to get him to be more online."

Hudson, who had to have his surgery redone last year when he was just weeks away from playing, will be used as a reliever initially when he does finally return. When that will be is uncertain, as the D-backs are taking things more cautiously with him this time around.

"I have an idea in my head, but I hate to say it," Gibson said.

Reynolds, a left-handed reliever, is hoping that he can pitch at some point this year, even if it's just for a handful of games in September.

"If you give them something out of the 'pen this year some time, it really builds for next year," Gibson said.

Reliever Harris gets second chance in Majors

ARI@SF: Harris strikes out three Giants in seventh

PHOENIX -- When he was optioned to Triple-A Reno in April, D-backs reliever Will Harris did not pout or complain. Instead, he took responsibility for it, and that's probably why he finds himself back in the big leagues.

"I took it as I had an opportunity to start the year, which is all you can ask for, and I didn't necessarily make the most of it," Harris said. "So I can't really be mad at anybody."

Harris made the Opening Day roster, but he was optioned to Reno on April 14 with a 9.72 ERA.

With Reno, Harris was 3-2 with a 1.13 ERA in 20 games, and he was recalled prior to Monday's game as the D-backs elected to go with 13 pitchers with the bullpen overtaxed of late.

"I knew the only way I was going to get back here was to pitch well," Harris said. "You know when you get sent down, you don't really know if you're ever coming back. So you have to take the approach that the only way I'm going to get back is by pitching well, and everything else falls into place. Now I've got another opportunity, and it will be whatever I make of it."