Miles Mikolas has shown a commendable pitching performance this season for the St. Louis Cardinals, holding a 4-2 record with a 3.51 ERA and a 3.68 FIP over 10 starts. Despite these promising figures, a close regression analysis reveals worrying trends that suggest his current success may not be sustainable.
Examining Mikolas’s Surface Success Versus Expected Performance
Mikolas’s statistics present a mixed narrative. His official ERA appears strong, especially when excluding a particularly poor outing against the Boston Red Sox in which he allowed eight runs in just 2.2 innings. Without that start, his ERA would fall to an impressive 2.23, highlighting how one game can skew results. The team has also benefited from his presence, winning the last five games in which he started since mid-April. However, underlying metrics such as his expected ERA (4.39) and expected FIP (5.00) both indicate that his overall performance may decline soon, hinting at regression.
Decline in Key Pitching Metrics Signals Potential Issues
Traditionally, Mikolas is not known as a strikeout-heavy pitcher, but he has maintained control by limiting walks effectively throughout his career. His lifetime walk rate stands at a remarkable 4.7%, though in 2024, that figure has worsened significantly to 7.5%. Although still better than average, the increased walk rate is concerning. Simultaneously, his strikeout rate has declined to a career-low 14.6%, placing him in the sixth percentile among all major league pitchers. These shifts imply reduced dominance over opposing hitters.
Additional indicators support a downward trend. His average fastball velocity has dropped from 92.8 mph last year to 91.7 mph, and his ability to induce swings and misses (whiff rate) on pitches has diminished from 16.4% to 14.8%. Furthermore, Mikolas’s groundball rate declined from 42% to 38.4%, while his fly-ball rate increased from 36.5% to 45.4%, suggesting more balls are being hit into the air.
Increased Fly Balls and Dangerous Hit Locations Raise Concerns
The rise in fly balls, including a pull fly-ball rate near the league’s lowest at 25.6%, is notable because pulled fly balls and line drives often translate into extra-base hits or home runs. Worsening this, Mikolas has increased the frequency of throwing “meatballs”—pitches right in the heart of the plate that hitters are more likely to capitalize on. His meatball rate has risen from 9.1% last year, the third-highest in baseball, to 9.6% this season, which now ranks seventh highest in the league.
Adjustments in Pitch Selection Offer Some Positive Outcomes
Despite these underlying struggles, Mikolas has seen success by improving his curveball effectiveness. Opponents have a very low weighted on-base average (.127) against this pitch, which also produces whiffs about 25% of the time, and the average exit velocity off it is only 85.9 mph. This softer contact helps offset some issues caused by his declining velocity and increased hittable pitches.
Overall, hitters face softer contact, with a 21.3% soft-hit rate this season. However, softer contact may not be enough to sustain Mikolas’s success, especially as his lower velocity and higher walk rate could allow hitters to adjust over time. Additionally, favorable defensive support may be contributing to his current results—St. Louis Cardinal outfielders rank fourth in Major League Baseball for Outs Above Average, helping convert those fly balls and other defensive opportunities into outs.
Implications of Regression for Mikolas and the Cardinals
While Miles Mikolas’s statistics paint the picture of a reliable rotation piece with respectable numbers for a bottom-of-the-rotation starter, the detailed metrics indicate a looming regression. His diminished strikeout ability, increased walks, reduced velocity, and elevated risk of hard contact all point toward potential struggles ahead if adjustments are not made. For the Cardinals, understanding these warning signs is crucial to managing their pitching staff and maintaining competitive performance in future games.