Dbacks ref and notes

Del Castillo (calf) is continuing to rehab and has begun running, Alex Weiner of Arizona Sports reports.

Del Castillo will operate as a designated hitter in minor-league games before the organization makes its next move. It’s unclear what the Diamondbacks have in mind once Del Castillo is ready to play. He could serve as a third catcher and part-time DH in the majors or head back to the minors where he can continue to develop defensively.

Arizona manager Torey Lovullo said Tuesday that Gurriel (knee) will serve as a designated hitter in the minor-league games, Alex Weiner of Arizona Sports reports.

The manager added that Gurriel is close to returning to play defense. He’s participated in defensive drills and shagging but not yet defended a position in game action.

Kelly (back) will start a backfield game at Arizona’s training camp Saturday, Alex Weiner of Arizona Sports reports.

If all goes well Saturday, Kelly will then pitch rehab outings for Triple-A Reno on April 3 and April 8 in preparation to rejoin the Diamondbacks for his subsequent appearance. He was able to throw 52 pitches and worked into the third inning in his final spring outing Monday and said he still has work to do in terms of timing and mechanics. The right-hander is expected to open the season on the 15-day injured list.

Marte was scratched from Tuesday’s exhibition game due to lower-leg soreness, Alex Weiner of Arizona Sports reports.

This provides a bit more context about the issue bothering Marte, which was originally classified as undisclosed. Regardless, the issue is minor, and there is no concern that Marte will miss Opening Day.

Puk (elbow) has begun throwing bullpen sessions off a mound, MLB.com reports.

The sessions are described as “short box,” which is when a catcher sets up just in front of home plate. Puk underwent internal brace elbow surgery last June and is expected back sometime around the All-Star break.