5 paths the St. Louis Cardinals can take to find a fifth starter

Ever since Steven Matz went down with a lower back strain on May 1st, the Cardinals have struggled to fill his spot in the rotation. Some off days early in the month allowed the team to get by with just 4 regular starting pitchers, but Matthew Liberatore has had to fill in for three starts that would have otherwise been Matz's. The front office has botched this situation thus far.

As of now, there is no timetable regarding Steven Matz's return. The last update, per John Denton of MLB.com, was that Matz hadn't begun a throwing program as of May 12th. He instead received another pain-killing injection. Matz hasn't resumed playing catch at any distance, and his 15-day stint could quickly transition into a 60-day IL placement if he doesn't show improvement soon.

Libby was an excellent reliever before transitioning back to the rotation. He was a starting pitcher in the minors, but his struggles in that role in St. Louis pushed him to be a reliever this year. While Liberatore wasn't featured in the back of the bullpen -- those spots have been reserved for Andrew Kittredge, JoJo Romero, and Ryan Helsley -- he played the important role of bridging starters to those three.

Below you'll find Libby's splits this year as a starter and a reliever.

It is clear (and has been since 2022) that Matthew Liberatore has not been a successful starting pitcher in the majors. Whether this is attributable to a lack of fastball velocity when being extended, hitters understanding him better the third time through the order, or a multitude of other issues, it's clear now that Matthew Liberatore is not built to be a starting pitcher for the Cardinals, at least for now.

That has forced the team's hand. Now, they must scramble to find a fifth starter to take Matz's place in the rotation. The team has some internal choices in the minors, but there are also a couple of outside options that could help the team in the near and distant future. The Cardinals could promote or sign a true fifth starter -- someone who will give the team a fighting chance to win but not blow anyone out. They could also make a move for another high-end guy to bolster the rotation for the long haul.

Here are 5 pitchers who could become the fifth starter for the St. Louis Cardinals.

Zack Greinke

I'm starting off this list with the two least likely options. Zack Greinke is only marginally more likely than Tink Hence, if that. Greinke is currently a free agent, and he's been working out in Arizona to stay as fresh as can be should a call come his way.

Greinke absolutely fits the age minimum to be a starting pitcher on the Cardinals in 2024, as he is 40 and will remain so until late October. When the 2023 season ended, Greinke wasn't quite sure if he would return for another season. The 20-year veteran has already racked up quite a few accolades including a Cy Young Award, 6 Gold Gloves, 6 All-Star selections, a 2-time ERA leader, and a couple of World Series appearances.

Greinke's showing these past two seasons has left a lot to be desired. He played for the Kansas City Royals, the team that drafted him 6th overall in the 2002 MLB draft. He has pitched a total of 279.1 innings between 2022 and 2023 with a 4.38 ERA, 4.39 FIP, 1.307 WHIP, and just 5.5 strikeouts/9 innings. Greinke hasn't walked many batters, but he's been prone to allowing hits often.

If the Cardinals were to sign Greinke, it would be only temporarily unless he shows promise. If he has flashes of his excellence, then Steven Matz can move to the bullpen upon his return, a place where he saw success last year. Don't expect much out of Greinke, but at least Oli Marmol can keep Liberatore in the bullpen, a place where he, too, is seeing more success. Greinke's track record gives Marmol a bit more confidence rolling him out every 5 days as well.

A trade for a starting pitcher

This option would be the best for the team and organization in my opinion. There are already whispers of starting pitchers being available on the open market, and the Cardinals could jump their competition by trading for one now. The San Diego Padres boosted their playoff odds when they traded for Luis Arraez a couple of weeks ago, and the Cardinals could do the same if they trade for a starter now.

If John Mozeliak and Co. really believe they have a team that can compete in the playoffs, they should trade for a starter now to increase their odds that much more rather than waiting until the deadline. It's entirely possible the Cardinals are all but eliminated by the time August rolls around.

Erick Fedde of the Chicago White Sox is having himself a career season. He has a 2.60 ERA in 52 innings pitched with 50 strikeouts. Fedde isn't a free agent until after 2025 due to a 2-year contract he just signed. Fedde just pitched on Monday, so he's slated for a Saturday start. The Cardinals would have to give up some prospects, but it may be worth it.

Jesus Luzardo just returned from the injured list, and he's always been connected to the Cardinals. He's slated to start Wednesday, but either he or Gibson could be moved back to make space. Luzardo has a 5.02 ERA in 37.2 innings, but his career numbers show that he is capable of much more.

The Los Angeles Angels are likely a seller at the deadline, and Tyler Anderson has one more year of team control until he becomes a free agent. The lefty has a 2.72 ERA in 56.1 innings. While he isn't striking out many batters (40 total), he is limiting damage with a 1.065 WHIP. He will pitch Wednesday, so he's on the same timetable as Luzardo and Gibson.

A trade for a good starting pitcher would solve the team's problems now and alleviate concern for this upcoming offseason. This would be the wisest path forward, though it's not likely.

Zack Thompson or Andre Pallante

The Cardinals optioned left-handed Zack Thompson to AAA Memphis on April 24th with outfielder Jordan Walker. The plan for Thompson was to get stretched out to potentially help as a starter this year or next. He has been yo-yoed his entire career.

Before being demoted, Thompson was used as a reliever, and he had a 9.53 ERA in just 17 innings pitched in the majors. Since joining Memphis, Thompson has pitched 14.2 innings in 3 starts (4 appearances); he has a 1.84 ERA, 1.295 WHIP, and he is striking out almost 9 batters per nine innings. He hasn't pitched more than 4 innings in a start, but his pitch count has incrementally increased with each game.

Andre Pallante was having a terrible start to his year in St. Louis. He threw 10 innings with only 6 strikeouts, a 6.30 ERA, and a 1.900 WHIP. His slider and sinker were getting destroyed, and he was quite ineffective. Pallante, like Thompson, was demoted to build up and increase his bulk abilities. He has pitched in 4 games (all starts), and he has a 2.20 ERA with 9 strikeouts in 16.1 innings pitched with the Memphis Redbirds. While Pallante has been good at limiting runs, he has continued to walk batters at an excessive rate. He has 13 walks to just 9 strikeouts in Memphis.

Thompson last pitched on the 15th, so his schedule doesn't line up very well, and Pallante pitched on the 17th, so his next start doesn't exactly fit the bill either. Both of these pitchers could use more fine-tuning in the minors, so while it's possible one of the two is called upon, it's not likely.

Sem Robberse

Sem Robberse is the best option available internally to replace Steven Matz and Matthew Liberatore as the fifth starter. Robberse has done all he needs to in the minors, and it's nearing time that he gets his chance in St. Louis with the big league club.

The Cardinals acquired the Dutchman when they traded Jordan Hicks to the Toronto Blue Jays at last year's deadline, and Robberse has not disappointed. The right-handed starter has pitched exclusively in Memphis this year, and he has a 3.29 ERA, .210 batting average against, and 1.04 WHIP in 54.2 innings (9 starts) this year.

Robberse started off the season as one of the organization's best minor league pitchers in April. He had an 8-inning, 9-strikeout outing on April 19th, and he followed that up by pitching 7 innings and only allowing 2 runs to score on April 26th.

May has been a bit of a struggle for Robberse, as he has two outings where he's given up 6 runs -- one with 4 home runs on May 8th. His 5.04 ERA in May is a bit concerning, but he has still been able to put together an admirable season.

Robberse last pitched on May 19th, so he is perfectly lined up to slot in as the team's fifth starter. Calls for Sem to be promoted have only grown in volume since Matz went down, and it's seeming more and more likely with each passing day that he will be chosen to pitch this next time around the rotation.