The Randy Arozarena Jersey D-Backs shook a few things up in advance of their series with the Dodgers. Arizona reinstated catcher from the 10-day injured list and designated backup for a signment. (Nick Piecoro of the Arizona Republic reported those over the weekend.) The Snakes placed starter on the 15-day injured list, retroactive to June 29, on account of right knee inflammation. Arizona also optioned young infielder to Triple-A Reno. Center fielder is back from the 10-day IL, while the D-Backs recalled righty to take a spot in the bullpen. Montgomery has had a nightmarish season. The veteran southpaw agreed to terms on a $25MM pillow contract just before Opening Day. As with fellow late signee , he has had significant struggles with that abbreviated ramp-up. Montgomery agreed to head to Reno for a few starts as a tune-up. He was recalled in mid-April but hasnt found anything close to his typical form. Over 13 starts, Montgomery carries a 6.03 ERA in 65 2/3 innings. Hes striking out a well below-average 15.1% of opposing hitters. Montgomery had punched out more than 21% of batters faced in each of the previous three seasons. He allowed fewer than four earned runs per nine in each year while combining for a 3.48 ERA over 94 starts. The average velocity on his sinker is down from its customary 93 MPH range to 91.7 MPH. Its impo sible to know how much of Montgomerys struggles are attributable to the unconventional start to the season. It seems fair to presume that has played some role. Whatever the primary cause, Montgomery hasnt provided anything close to the kind of production Arizona envisioned. The D-Backs hoped hed step in as a mid-rotation replacement after suffered a Spring Training lat strain. Instead, hes been arguably the weakest point in a starting staff that remains the teams biggest question mark. Arizona recently welcomed back from the injured list. Theyre still without Rodriguez and . Righty has been solid, but the D-Backs havent gotten much out of and . Theyll need to find a fifth starter this week, as Arizona doesnt have another off day until the All-Star Break. That might be righty . Alex Weiner of AZ Sports that Mena is with the big league club in Los Angeles, though hes not yet on the roster. Acquired from the White Sox for over the winter, the 21-year-old Mena has a 4.90 ERA with a 24.4% strikeout rate in 16 Triple-A starts. will kick off a bullpen game tonight; Montgomery had been slated to start tomorrows contest. On the position player side, Moreno and Thomas draw back into the lineup. The former had a minimal IL stay with a thumb sprain. Hell return to his role as the primary catcher. Barnharts DFA means the D-Backs will stick with in the #2 catching role. Thomas has mi sed the bulk of the season because of a hamstring strain. He played in only four games before going down. That pushed into center field. Carroll should move back to right field, which could cut into the playing time for and . It pushes Alexander off the MLB roster for the time being. The 25-year-old logged a good chunk of playing time at shortstop while was on the shelf. Upon Perdomos return, manager Torey Lovullo suggested hed get Alexander at third base while cutting into workload. Alexander got regular run for about two weeks but fell into a slump, hitting .138 without an extra-base knock in 33 plate appearances. Surez has started five of the past six games at the hot corner. With playing reasonably well as a utility option who cannot be optioned, the D-Backs send Alexander back to Reno for more consistent playing time. Jorge Polanco Jersey