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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

Peralta (3-1) allowed three runs on three hits and six walks over five innings Sunday, striking out five and taking a loss against the Cubs.

Advice: Despite the command issues all afternoon, Peralta kept the Cubs off the board until coughing up three runs in the fifth inning. He took his first loss of the year and has now failed to complete six frames in three straight outings. During that stretch, he's posted a 6.00 ERA with a 17:11 K:BB. Peralta forced 13 whiffs Sunday but threw just 51 of 97 pitches for strikes. His season ERA climbed to 3.49 through 38.2 frames. As of now, it's unclear when Peralta will make his next start, as the decision on his pending suspension still needs to be determined. Rotowire.com Yesterday, 8:19 pm

Kremer (3-2) yielded a hit and a walk over six shutout innings Sunday, striking out six and earning a win over the Reds.

Advice: Kremer retired the first 13 batters he faced before putting two straight runners on in the fifth inning. He avoided any damage and cruised to his third straight victory. During the win streak, he's posted an impressive 1.96 ERA and 20:6 K:BB through 18.1 frames. Kremer forced 13 whiffs Sunday, including seven with his four-seam fastball. He'll carry a 3.57 ERA into his next start, which is projected to be at home against Arizona. Rotowire.com Yesterday, 7:55 pm

Sanchez allowed two runs on three hits and three walks over four innings in a no-decision Sunday. He struck out two during the win over Oakland.

Advice: Sanchez threw four innings for the second straight outing and would've been in line for the victory if he went one more Sunday. He kept the A's scoreless through three frames before coughing up a pair of runs in the fourth. Sanchez lowered his ERA to 7.50 with a lackluster 11:7 K:BB through 18 frames. As of now, he's likely sliding back to the bullpen with Braxton Garrett (shoulder) and Jesus Luzardo (elbow) both expected to return soon. Rotowire.com Yesterday, 7:34 pm

Taijuan Walker posted a quality start in Sunday night’s victory over the Giants, surrendering three runs on five hits across 6 1/3 strong innings of work.

Advice: Walker racked up seven strikeouts on the evening while issuing just one free pass. The Giants scratched out a run in the opening inning on an RBI double by Michael Conforto, then Walker shut them down completely until Thairo Estrada connected on a two-run blast in the seventh. The 31-year-old hurler got just six swings and misses on 90 pitches in the ballgame, posting a CSW of 30 percent. Now 2-0 on the season, he’ll carry a 6.39 ERA, 1.26 WHIP and an 11/3 K/BB ratio (12 2/3 innings) into next weekend’s tilt against the Marlins in Miami. Rotoworld Yesterday, 7:11 pm