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Diamondbacks manager Torey Lovullo said Sunday that he believes Perdomo (knee) will start hitting this week, Alex Weiner of Arizona Sports reports.

Advice: Perdomo has already started some baseball activity, including fielding grounders and throwing. A rehab assignment for the shortstop should follow his return to the batting cages, but a timeline for his return to MLB has not yet been established. Rotowire.com 26 minutes ago

Nelson (2-2) picked up the win over the Padres on Sunday, allowing four runs on eight hits and a walk while striking out three over five innings.

Advice: Nelson wasn't spectacular in his return from a trip to the injured list, but he didn't need to be after the Diamondbacks plated 11 runs through five innings. Nelson served up a two-run homer to Jackson Merrill in the second before Kyle Higashioka doubled in Ha-Seong Kim after he walked. The Padres would scratch across another run in the third before being silenced the rest of the way. Nelson was able to get up to 99 pitches and has slid into the rotation spot of Tommy Henry who was optioned to Triple-A Reno last week. Nelson owns a 5.23 ERA, 1.60 WHIP and 16:6 K:BB in 20.2 innings and is slated for a tough road matchup against Baltimore his next time out. Rotowire.com 39 minutes ago

Walker (2-0) earned the win over the Giants on Sunday, allowing three runs on five hits and a walk while striking out seven over 6.1 innings.

Advice: The Giants got to Walker in the opening frame with a run, but he was able to silence them the rest of the way until Thairo Estrada crushed a two-run blast in the seventh to make it a 5-3 ballgame and end Walker's night. Walker has now carried strong outings into the seven inning in back-to-back starts to open up the season but hasn't quite been able to seal the deal. He has a 3.00 ERA through innings 1-6 and a 67.50 ERA in the seventh frame. His spot in the rotation is secure after the Phillies announced Spencer Turnbull would be operating as a bulk relief option moving forward. Walker owns a 6.39 ERA, 1.26 WHIP and 11:3 K:BB in 12.2 innings and lines up to face the Marlins on the road his next time out. Rotowire.com Today, 4:12 am

Boyle, who was lifted after one inning in Sunday's loss to the Marlins, was suffering from lower-back pain that got worse the more he threw during the frame, MLB.com reports.

Advice: Boyle's performance clearly seemed to be affected by his physical limitations, as he allowed four earned runs on a hit and three walks over his sole inning on the mound. Manager Mark Kotsay confirmed Boyle would undergo an MRI on Monday to determine the severity of the injury, at which point the right-hander's chances of making his next scheduled start Saturday against the Mariners will become clearer. Per Sonja Chen of MLB.com, right-handers Osvaldo Bido and Joey Estes, both of whom have big-league experience and are on the 40-man roster, are candidates to be called up from Triple-A Las Vegas should Boyle miss at least one turn through the rotation, although she adds Oakland has long relievers Mitch Spence and Kyle Muller as options on the big-league roster. Rotowire.com Yesterday, 11:01 pm

McKenna went 1-for-3 with a solo home run, a walk and two total runs scored in Sunday's 11-1 win over the Reds.

Advice: McKenna has gotten into the lineup against the last three southpaws the Orioles have faced -- twice in center field and once in left. The outfielder has three hits this season, two of which have left the yard. He's still unlikely to see much more than a short-side platoon role, and McKenna's stay on the major-league roster is likely to end once Austin Hays (calf) is activated from the injured list. Rotowire.com Yesterday, 9:08 pm