Cardinals manager Oliver Marmol said Friday that an MRI showed that Matz has a "protruding disc" in his lower back, John Denton of MLB.com reports.

EDGE Analysis

Matz was placed on the 15-day IL on Friday after sustaining a lower-back injury in Tuesday's loss to the Tigers. Matz received a pain-killing injection for the injury Friday, and the southpaw will be reevaluated early next week. He went 1-2 over six starts with a 6.18 ERA and 1.73 WHIP before landing on the injured list.

The Cardinals placed Matz on the 15-day injured list Friday, retroactive to May 1, with a lower-back strain.

EDGE Analysis

Matz attempted to pitch through back soreness in his last start Tuesday in Detroit, but it didn't go well and an MRI has revealed a strain. It's not clear at this point how long he might be on the shelf. The Cards haven't revealed who will take Matz's spot in the rotation, but his next turn would be Tuesday and Sem Robberse would be on regular rest that day.

Matz will undergo an MRI on his injured back Thursday, Katie Woo of The Athletic reports.

EDGE Analysis

Matz attempted to pitch through a back issue during a loss to the Tigers on Tuesday, but he struggled and will now undergo testing. The Cardinals will wait until the results of the exam come in before deciding on a potential stint on the injured list for the left-hander. Of the potential candidates on the Cardinals' 40-man roster that could take Matz's rotation spot, Sem Robberse has pitched the best at Triple-A Memphis, sporting a 1.82 ERA and 29:6 K:BB over 29.2 innings.

Matz pitched through a lower-back injury during Tuesday's loss to the Tigers, Derrick Goold of the St. Louis Post-Dispatch reports.

EDGE Analysis

Matz first dealt with soreness while jogging a few days before his start, but he responded well to treatments and didn't have an issue during his between-starts bullpen session, clearing the way for him to make his scheduled start. However, Matz's velocity was well down in the outing and he wound up allowing four runs on seven hits and two walks over 3.1 innings, admitting after the start that he "wasn't able to finish like I normally do." The Cardinals weren't ready to say after the outing whether Matz might need a trip to the injured list, but it sounds like it could be a possibility. The lefty's next outing is tentatively lined up to come either Sunday versus the White Sox or Monday against the Mets.

Matz escaped with a no-decision in the second game of Tuesday's doubleheader against the Tigers, giving up four runs on seven hits and two walks over 3.1 innings in an 11-6 loss. He struck out only one.

EDGE Analysis

The southpaw got the hook after 73 pitches (45 strikes) with the Cardinals in a 4-0 hole, but Matz avoided the loss when the two teams combined for eight runs in the fifth inning. It was his shortest start of the season so far, but he's failed to complete five innings in three of his last four outings, getting tagged for 17 earned runs in 17.1 frames over that stretch. Matz will carry a 6.18 ERA, 1.73 WHIP and 17:11 K:BB through 27.2 innings into his next start, which could come at home this weekend against the White Sox.

Matz and the Cardinals won't play Monday against the Tigers after the game was postponed due to inclement weather in Detroit.

EDGE Analysis

The game will be made up as part of a traditional doubleheader Tuesday. As a result of the postponement, Matz will likely just be pushed back one day in the pitching schedule to start one half of Tuesday's twin bill.

Matz (1-2) took the loss Tuesday against Arizona, allowing seven runs on six hits and three walks over 4.1 innings. He struck out four

EDGE Analysis

All of the runs against Matz came in the third and fifth innings. In the third, he walked a pair of batters and allowed an RBI base hit to Lourdes Gurriel before Christian Walker launched a three-run homer. in the fifth, Matz allowed hits to three straight batters, two of which scored after he was pulled. After giving up three earned runs in his first 15.0 innings, Matz has surrendered 12 earned runs in his last two starts (9.1 innings) with eight K's and six walks. He's lined up to face the Tigers in Detroit on Monday.

Matz (1-1) took the loss against Oakland on Wednesday, allowing five runs on seven hits and three walks over five innings while striking out four.

EDGE Analysis

Matz got off to an decent start, striking out three of the first six batters he faced before getting tagged for two runs on an Esteury Ruiz home run in the bottom of the third. The lefty would then allow three consecutive hits to open the fifth, leading to three more runs coming across for Oakland as he took his first loss of the season. Matz had not allowed more than two runs in any of his first three starts coming in, though he's now given up 15 hits over his last 9.2 innings of work. The home run from Ruiz was also the first long ball that Matz has allowed this season.

Matz yielded four runs (one earned) on eight hits over 4.2 innings during a no-decision Friday. He struck out two in the win over Arizona.

EDGE Analysis

Matz repeatedly worked around potential danger through four shutout frames before Arizona woke up and scored six in the fifth inning, with four going on Matz's line. Fortunately for him, only one run was earned due to his own throwing error. Matz had allowed just two runs through 10.1 innings before Friday's start and he turned in his shortest outing of the year. The veteran southpaw is sporting a 1.80 ERA with an 8:3 K:BB over 15 frames. Matz is projected to start in Oakland next week.

Matz (1-0) picked up the win Saturday, allowing four hits and a walk over five scoreless innings in a 3-1 victory over the Marlins. He struck out three.

EDGE Analysis

The veteran southpaw wasn't dominant, generating only 10 swinging strikes among his 85 pitches, but all four hits off Matz were singles as he again limited hard contact. He sports a 1.74 ERA through 10.1 innings to go with a 6:3 K:BB, and Matz lines up to make his next start on the road next weekend in Arizona.