FanSided

3 productive KC Royals prospects who could make MLB debut in September

By Jacob Milham |
/ Joe Camporeale-USA TODAY Sports
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As the KC Royals begin the so-called gauntlet, some major MLB dates are waiting around the corner. One such date is Sept. 1, or the day for September call-ups.

Traditionally, that day marked the expansion of MLB rosters from 25 to 40 players, offering teams the chance to call up additional players from the minors. This period allowed teams to give prospects a taste of the majors, add extra depth, and rest regular players in preparation for the postseason. For losing teams, fans also enjoyed seeing young prospects get their first shot in the big leagues.

What will the KC Royals do with the expanded rosters?

However, starting with the 2020 season, MLB implemented a rule change that limited the September roster expansion. Instead of expanding to 40 players, teams are now allowed to increase their rosters to just 28 players, with a maximum of 14 pitchers. The intention behind this change was to maintain a more competitive atmosphere and avoid the slower pace often associated with larger rosters. It also aimed to keep the game more consistent with the roster sizes used during the rest of the season.

No matter the reason, Kansas City fans know this team has to be strategic with their additions after the calendar turns over. There are several players, like pitcher Evan Sisk or outfielder Drew Waters, who have already made their MLB debuts and can help this team this fall. But, what are some players who haven't made their debuts that the team should consider? Here are my three.

SS Cam Devanney

2024 stats: .244/.332/.437, 17 HR, 59 RBI, 98 wRC+

Similar to other players' situations, infielder Cam Devanney’s potential addition to Kansas City’s roster this September is highly situational. Acquired in a trade with the Milwaukee Brewers this past winter, Devanney has quietly become a valuable member of the Omaha roster.

Devanney's calling card is his defense, with a range that ranks among the best in Triple-A. He makes difficult plays look routine and serves as the anchor for Omaha's solid infield defensive unit. However, his bat undeniably limits his MLB potential. While he has consistently been a near-average hitter this season, his defensive value has largely secured his spot in the lineup. He puts the ball in play often, but his unorthodox batting motion and lack of power leave him with a narrow margin for error.

There’s some nuance to consider here. I firmly believe that veteran Garrett Hampson's job should be in jeopardy. His versatility and speed no longer outweigh the negative impact of his ice-cold bat and fielding blunders. If Kansas City decides to replace Hampson, Devanney is a sensible replacement candidate.

OF John Rave

2024 stats: .273/.359/.493, 18 HR, 80 RBI, 119 wRC+

If Kansas City is hard-pressed to add another centerfielder to the fold this September, the easiest answer is Waters. He is already on the 40-man roster, has the every-day outfielder upside, and Kansas City invested in him years ago. But, John Rave should be a storng secondary option come September callups.

Rave, an Illinois State product, was a major-league spring training invitee for the second consecutive year this past spring, showing Kansas City at least has the 26-year-old outfielder on their radar. He had a strong showing in the Arizona Fall League and earned Rising Star honors with two home runs and six extra-base hits in 18 games.

Baseball has always been a game asking what a player has done lately, and Rave has done plenty. He has been an above-average bat in Triple-A across the entire season, including career bests in strikeout percentage (21.9%), ISO (.220), and wOBA (.374). His process at the plate hasn't changed much this season, but some minor swing mechanic changes have improved his results immensely.

A solid bat, coupled with Rave's extensive defensive highlights in centerfield, make him an enticing fourth or fifth outfielder prospect. Rave will be 27 come Opening Day 2025, tightening his MLB window. He isn't a player that I want to see in the everyday lineup come September. However, he more than deserves a shot on the 28-man roster.

LHP Evan Sisk

2024 stats: 6-2, 47 G, 9 SV, 46 1/3 IP, 68 K, 23 BB, 1.75 ERA

I already brought up left-handed reliever Evan Sisk as a reinforcement candidate from Omaha. But, the past week's action only further proves Kansas City should add the southpaw come September.

Sisk is having a career year, no matter how you slice it. Whether it be his miniscule 1.75 ERA and 2.26 FIP, striking out batters at a 36.0% clip, or his splits against left-handed batters, Sisk is more than ready for The Show. His pitching arsenal isn't overpowering with velocity, but a tough arm slot coupled with exceptional breaking pitches makes him more than effective in Omaha.

Sisk's left-handedness in itself adds a lot of value here, especially since he has so often served in high-leverage situations against heavy-hitting lineups. That's absolutely been the hallmark of his career: the ability to consistently put out left-handed batters, making this a very nice addition for the Royals. Will Smith and Angel Zerpa's most recent struggles only increase Sissk's value and possible role.

Sisk has continuously raised the level of his game each season. After being traded from the Minnesota Twins, he has honed his control and pitch selection, evolving into a more versatile and dependable pitcher. His time at Triple-A, paired with standout performances, indicates he’s ready to make the jump to the majors and play a key role in the Royals' pitching staff during this part of the season.

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