Lamb took groundballs at third base during batting practice Monday, Nick Piecoro of the Arizona Republic reports.

EDGE Analysis

The Diamonadbacks optioned Ildemaro Vargas to Triple-A Reno on Monday, so Lamb becomes the primary backup at third base to Eduardo Escobar. Lamb came up to the majors at the hot corner and is making a transition to first base in 2019. Having him take fielding practice at his old position gives manager Torey Lovullo a path toward having both Lamb and first baseman Christian Walker (6-for-11, two HR) in the lineup together.

Lamb is not in the lineup Monday against the Padres.

EDGE Analysis

Lamb will retreat to the bench for Monday's series opener with a left-hander in Matt Strahm slated to take the mound for the opposition. In his place, Christian Walker will start at first base and hit fifth.

Lamb went 0-for-2 with a walk and a run scored before being removed as part of a double-switch to start the bottom of the fifth inning of Sunday's 8-7 loss to the Dodgers.

EDGE Analysis

The early-season noise out of backup Christian Walker's bat makes Lamb subject to the double-shift if needed, which could limit his plate appearances in some games. Diamondbacks manager Torey Lovullo is looking for ways to give Walker playing time, and the team doesn't lose anything defensively going from Lamb to Walker.

Manager Torey Lovullo said Lamb will have to earn his at-bats against left-handed pitching, Nick Piecoro of The Arizona Republic reports.

EDGE Analysis

Lamb, who hit just .170 with a .493 OPS against southpaws last season, was not in the lineup for Thursday's season opener with southpaw Hyun-Jin Ryu toeing the rubber for the Dodgers. While Lovullo previously dismissed the idea of Lamb platooning with Christian Walker at first base, it sounds like that could wind up being the case if the 28-year-old fails to show improvement against same-handed pitching.

Lamb is not in the Opening Day lineup against the Dodgers.

EDGE Analysis

With lefty Hyun-Jin Ryu on the hill for the Dodgers, Christian Walker will get the start at first base, hitting fifth. This could be a strict platoon all season, with Lamb only starting against righties.

Lamb (back) returned to the lineup Thursday and went 1-for-2 with a walk against the Angels.

EDGE Analysis

Lamb had missed time this week after experiencing back tightness last Sunday. He is expected to the Diamondbacks' starting first baseman come Opening Day.

Manager Torey Lovullo confirmed Lamb (back) will be the everyday first baseman, starting against both right-handers and left-handers, Jesse Sanchez of MLB.com reports.

EDGE Analysis

Lovullo added that he's open to adjustments as the season progresses, so Lamb isn't assured of a full-time role all season, He struggled against left-handers last season and has played just 29 innings at first base at the professional level. The 28-year-old Lamb is expected to return from his back injury Thursday.

Lamb (back) will get on the field Wednesday and take batting practice, Richard Morin of the Arizona Republic reports.

EDGE Analysis

Lamb appears to have escaped a serious injury after being pulled from Sunday's game. The Diamondbacks will get a look at him swinging a bat before determining next steps.

Lamb (back) is not in the lineup Tuesday against the Padres.

EDGE Analysis

Lamb is still nursing a tight back and will miss a second straight game as a result. In his absence, Wilmer Flores will start at first base, with Ketel Marte manning second and Adam Jones in center. There has been no indication that the issue will affect Lamb's status for the start of the season at this point, though it will be a situation to monitor with Opening Day drawing closer.

Lamb left Sunday's game against the White Sox with back tightness.

EDGE Analysis

Lamb was already having a tough spring, hitting just .200 heading into Sunday's game. He's expected to open the season as the Diamondbacks' starting first baseman, though an extended absence could see Wilmer Flores slide over to first with Ketel Marte playing second.