Nolan McLean's Strikeout Stuff Is Elite — But His Pitch Mix Problem Could Cost Colorado Against Arizona

Nolan McLean takes the mound Friday night at Chase Field for his eighth start of the season, and the surface numbers are deceiving. Per MLB.com, the Colorado righty carries a 2.97 ERA and an 11.67 K/9 rate — good enough for second among NL pitchers with at least 30 innings. The problem isn't talent. It's sequencing, and it's getting worse.

McLean's last outing in Anaheim lasted just four innings on 78 pitches. The culprit, by his own admission, was an overreliance on his sinker. Once Angels hitters stopped respecting his offspeed arsenal, they sat on the sinker and made him pay. That pattern — early effectiveness collapsing as hitters adjust mid-game — has become a recurring theme. McLean hasn't recorded a win since April 3, a stretch that spans five starts and reveals a pitcher who dominates early counts but unravels when he falls behind. "I just wasn't executing," McLean said after the Anaheim start. "It's really hard to pitch behind in counts."

The Arizona matchup adds a layer of complexity. McLean actually threw a quality start against the Diamondbacks on April 9 — 6 1/3 innings, two runs, three hits — but still took the loss. First baseman José Fernández went 2-for-3 with a single and a double, demonstrating an ability to read and drive McLean's offerings. The D-backs lineup carries enough contact ability at the top to exploit the same pitch-mix flaws the Angels exposed. If McLean can't commit to his offspeed pitches early, Arizona will do what Anaheim did: shorten the outing and run up the pitch count.

For prop bettors, the strikeout line is where the real tension lives. McLean's 11.67 K/9 will generate an attractive number on the board — likely in the 5.5–6.5 range depending on the book — but his inability to work deep into games suppresses his strikeout ceiling. Fewer innings means fewer opportunities, and a pitcher who's getting pulled in the fourth or fifth inning rarely cashes over strikeout props regardless of pure stuff. The team total angle is also worth monitoring: McLean's early exits put the Colorado bullpen on a short leash, and if Arizona forces a quick hook, the Rockies bullpen exposure could push the Chase Field total north of what oddsmakers have priced. Look at Arizona first-five innings offense as a value play — they've already shown the blueprint to get to McLean before he settles in.

The efficiency ceiling is the core issue. McLean has the swing-and-miss to be a legitimate strikeout prop play on nights when his full arsenal is working. Tonight is not one of those nights on paper. Until he demonstrates he can trust his offspeed pitches in high-leverage counts, fading his strikeout over and leaning toward the Arizona first-five team total represents the sharper play.