Nolan McLean posts 2.10 ERA in August, keeps NL Rookie of the Year case alive

Mets rookie right-hander Nolan McLean posted a 2.10 ERA in August, per Yahoo Sports, continuing a stretch of pitching that has kept him in the NL Rookie of the Year conversation deep into the 2026 season.

What happened

Yahoo Sports' monthly prospect report card for August credited McLean with a grade of A (HOLDING), noting that his August performance was nearly identical to his strong June and July. The caveat, per Yahoo Sports, was that he was somewhat more hittable, walked a few more batters, and struck out fewer than in those prior months — but the results held up.

Over five August starts, McLean threw 30.0 innings, allowed 18 hits, walked 16 batters, struck out 24, and posted a .205 BABIP, per Yahoo Sports. The earned run total came to 7, producing that 2.10 ERA for the month.

Why it matters

The August line matters because it did not arrive in a vacuum. McLean's season has had a shape to it — a strong April (2.55 ERA in 35.1 innings), a difficult May (6.10 ERA in 31.0 innings), and then a sustained recovery across June, July, and now August that has pulled his full-season numbers into genuinely respectable territory. The May detour, per the monthly splits reported by Yahoo Sports, included a .328 BABIP that suggested some misfortune alongside the struggles; the .205 BABIP in August sits at the other end of that spectrum, which Yahoo Sports acknowledged in its assessment.

What the arc describes, per Yahoo Sports, is a rookie who absorbed a rough patch mid-season and did not unravel. That is not a trivial thing to do in a major-league rotation at 27 starts and counting.

The numbers

Over 27 starts in 2026, McLean has thrown 155.2 innings, allowed 114 hits, walked 61 batters, and struck out 172, per Yahoo Sports. His season ERA sits at 3.06, and his BABIP across the full year is .260.

The monthly ERA progression tells the story in its own way: 2.55 in April, 6.10 in May, 2.79 in June, 1.78 in July, 2.10 in August. The May number is the one that stands out, and it stands out precisely because everything around it does not look like it. A pitcher who posts a 1.78 ERA in July after a 6.10 ERA in May is either very good, very fortunate, or some combination that a single season's worth of data cannot fully untangle. Yahoo Sports' grade of A (HOLDING) suggests the evaluators are treating the body of work as genuine.

The strikeout total of 172 across 155.2 innings is worth noting on its own terms. The walk total of 61 is the number that will draw the most scrutiny going forward — August's 16 walks in 30.0 innings was the highest single-month walk figure of his season, per the splits reported by Yahoo Sports, and it is the one area where Yahoo Sports flagged a step back even as the ERA held.

Where the club stands

The Mets enter September at 64-78 (.451), sitting 5th in the NL East, 20 games back in the division, and 10.5 games away from the Wild Card cut line, ranked 10th in that race. The team is on a one-game losing streak.

There is no diplomatic way to frame a 64-78 record in September, so the desk will not try. What it does mean, practically, is that McLean's starts are no longer carrying postseason weight — they are carrying something else: the weight of a young pitcher building a case, month by month, in front of evaluators and voters who will decide what his 2026 season meant.

The upcoming schedule has McLean slated to start Friday, September 4 against the San Francisco Giants at Citi Field, opposed by Matt Wilkinson. Before that, the Mets play Tuesday at Tampa Bay with Sean Manaea opposing Freddy Peralta, and Wednesday at Tampa Bay with Justin Hagenman opposing Griffin Jax.

September also brings the expanded roster window that opens league-wide on September 1, when active rosters grow from 26 to 28 players. For a club at 64-78, that window is less about a pennant push and more about getting looks at depth pieces — but McLean, already entrenched in the rotation, is unaffected by the shuffle.

What we don't know yet

Yahoo Sports' August report card was truncated before the full written assessment of McLean's month concluded, so the complete evaluator commentary did not come through. What Yahoo Sports did convey, through the grade and the surrounding framing, is that the A (HOLDING) designation reflects a pitcher whose standing did not change in August — which, after a month like July's 1.78 ERA, is itself a form of good news.

The NL Rookie of the Year candidacy referenced by Yahoo Sports is described as "strong," but Yahoo Sports does not name competitors, assign odds, or characterize the field. That framing belongs to Yahoo Sports, not to this desk.

Whether the elevated August walk rate — 16 in 30.0 innings — represents a mechanical issue, a sequencing adjustment, or simple month-to-month variance is not addressed in the material. It is the one number in the August line that points in a different direction than the ERA, and it is the one number worth watching when McLean takes the mound Friday against San Francisco.

What to watch

The September 4 start against the Giants is the next data point. McLean's walk rate in August was the highest of any month in his 2026 season, per Yahoo Sports' splits, and how that number behaves in September will say something about whether August was an outlier or a developing pattern. The strikeout total of 24 in August was also his lowest single-month figure since May, per the same splits, which gives the Friday start a pair of things to monitor without requiring any speculation about what they mean.

For the Rookie of the Year conversation, the remaining starts are the résumé. A 3.06 ERA across 155.2 innings is the number on the page right now, per Yahoo Sports. What gets added to it between now and the end of the regular season is, at this point, the only part of the story still being written.