MLB Stats Glossary 2026 — wRC+, OPS & Barrel with Japanese MLB Top 3

The most fundamental hitting metric: hits divided by at-bats. A .300 AVG is the traditional benchmark for a good hitter. While AVG misses walks and extra-base power, it remains a quick shorthand for contact skill. Best paired with OBP and OPS for a complete picture.

Measures how often a batter reaches base via hit, walk, or hit-by-pitch. One of the two components of OPS (OBP + SLG). A .370 OBP indicates excellent plate discipline. Widely regarded as more predictive of run-scoring than AVG alone.

Measures the average number of bases earned per at-bat. Singles count as 1, doubles 2, triples 3, and home runs 4. The power component of OPS. A .500 SLG marks a true power hitter.

The most widely used single hitting stat. Combines on-base percentage (OBP) and slugging percentage (SLG). Higher is better. Benchmarks: below .700 = below average, .800 = average, .900 = excellent, 1.000+ = elite superstar level. Shohei Ohtani posted an OPS of 1.014 in 2025, his third straight season above 1.000.

OPS adds OBP and SLG on equal terms, making it the most widely cited all-in-one batting stat despite theoretical imperfections (OBP is more predictive per unit). The .700/.800/.900/1.000 ladder maps neatly to below-average/average/good/superstar. In 2025, Shohei Ohtani posted 1.050 — his third straight season above 1.000 — while Seiya Suzuki (.838) led other Japanese MLB hitters. For park-to-park comparisons, pair OPS with wRC+ or OPS+.

Player Examples (2025)

Shohei Ohtani1.050

Seiya Suzuki.838

Masataka Yoshida.792

Measures how many runs a batter creates, park-adjusted and scaled so 100 = league average. Benchmarks: 100 = league average, 115–130 = above average, 130+ = good, 160+ = elite. A score above 150 is MVP-caliber — Shohei Ohtani posted a 172 wRC+ in 2025, leading the NL for a second straight year.

The 100-scale makes wRC+ self-explanatory — a wRC+ of 130 means 30% better than league average. Park-adjusted, so a .300 hitter at Dodger Stadium ranks above the same average at hitter-friendly Coors Field. In 2025, Shohei Ohtani posted wRC+ 195 — historically elite — with a 65+ point gap over Seiya Suzuki (132) and Munetaka Murakami (130). Use wRC+ when comparing players across different ballparks or eras.

Player Examples (2025)

Shohei Ohtani195

Seiya Suzuki132

Masataka Yoshida118

OPS adjusted for ballpark effects, scaled so 100 = league average. Like wRC+, higher is better. Enables fair comparisons across different ballparks and eras. Shohei Ohtani posted 190+ in 2025.

Assigns run-value weights to each way of reaching base (single, double, triple, HR, walk). More accurate than OPS for measuring offensive contribution. Benchmarks: .320 = league average, .340+ = above average, .370+ = good, .400+ = elite. Shohei Ohtani remained among MLB's elite hitters in 2025.

Unlike OPS, wOBA uses empirical run-value weights so each extra-base outcome is counted appropriately rather than lumping all power into a single SLG figure. A .320 wOBA is MLB average; .370+ is excellent; .400+ is elite. In 2025, Shohei Ohtani posted .438 — historically elite. Pair with wRC+ for a park-adjusted view of the same offensive quality; wOBA itself does not adjust for ballpark.

Percentage of batted balls hit at 98+ mph with optimal launch angle (~26-30°). Strongly predicts home runs and extra-base hits.

Statcast defines a Barrel as a batted ball at 98+ mph with a launch angle of 26–30 degrees — a profile that statistically predicts .500 BA and 1.500 SLG. At that threshold, the hitter has done essentially everything right. MLB average sits around 6%; 10%+ marks a genuine power threat; 15%+ is elite. Shohei Ohtani's ~19% Barrel rate in 2025 — among the highest in the Statcast era — was the primary engine behind his 54 home runs.

Player Examples (2025)

Shohei Ohtani19%

Seiya Suzuki10%

Masataka Yoshida8%

Measures raw power by removing singles from slugging percentage. Captures only extra-base hit contribution.

Player Examples (2025)

Shohei Ohtani.358

Seiya Suzuki.213

Masataka Yoshida.172

Percentage of batted balls hit at 95+ mph, tracked by Statcast. Measures raw power and contact quality. 40%+ is a good rate; elite sluggers like Shohei Ohtani regularly exceed 55%.

Player Examples (2025)

Shohei Ohtani55.8%

Seiya Suzuki44.2%

Masataka Yoshida41.8%

The percentage of plate appearances that result in a walk. Reflects a batter's plate discipline. Higher BB% boosts on-base percentage and signals that pitchers are reluctant to challenge the hitter. 10%+ is above average.

Player Examples (2025)

Shohei Ohtani14.2%

Seiya Suzuki9.8%

Masataka Yoshida11.3%

Percentage of plate appearances ending in a strikeout. Lower is better for batters — below 15% indicates strong bat-to-ball skills. Higher is better for pitchers; use alongside K/9 to evaluate swing-and-miss ability.

Measures how often balls in play become hits, excluding HR, Ks, and BBs. Used to evaluate luck and defense effects. League average is ~.300.

How often a batter swings at pitches outside the strike zone. Lower is better — 20% or below is elite plate discipline. Used alongside BB% to evaluate pitch recognition. A low Chase% pressures pitchers to attack the strike zone.

An absolute measure of how many more runs a batter contributes compared to a league-average hitter. While wRC+ is a relative (100-scale) metric, wRAA expresses value in actual runs. Zero is exactly league average; 40+ in a single season is MVP-caliber offense.

The most common pitching stat. Measures how many earned runs a pitcher allows per 9 innings. Lower is better. Under 3.00 is ace-level, though ERA is influenced by defense — pair it with FIP for a fuller picture.

ERA is a rate stat with Innings Pitched (IP) in the denominator, so early-season numbers can swing wildly until the sample stabilizes. A reasonable benchmark is at least 30 IP before comparing starters, and reaching the qualified threshold (1.0 × team games, i.e. 162 IP) before drawing season-level conclusions. A reliever with only 5 IP can show an ERA of 0.00 or 13.50, but that's almost entirely sample noise — the same pitcher's ERA after crossing 100 IP tends to converge sharply toward his true talent and final-season number. To separate the pitcher's own performance from defensive support, compare ERA against FIP (which only uses strikeouts, walks, and home runs); a large ERA-FIP gap is a flag for luck or defense rather than skill. Yamamoto's 2025 ERA 2.49 over 173 IP, Sasaki's ERA 3.20 over 124 IP, and Ohtani's pitching ERA 2.87 over 84 IP are all sample sizes near or above the qualified line, making the numbers genuinely reliable.

Player Examples (2025)

Yoshinobu Yamamoto3.00

Measures how many baserunners a pitcher allows per inning. Lower is better. Below 1.00 is ace-level.

WHIP shows baserunner volume per inning in a single number. Below 1.00 means almost no traffic — true ace territory. In 2025, Yoshinobu Yamamoto posted 1.08, placing him among MLB's best starters. WHIP is most meaningful for starters; small inning samples make it noisy for relievers. Pair with FIP or SIERA for a read on whether the WHIP is sustainable or driven by sequencing luck.

Player Examples (2025)

Yoshinobu Yamamoto1.08

Estimates a pitcher's effectiveness using only events they control: strikeouts, walks, and home runs. Removes defensive influence from ERA.

FIP uses only the three events pitchers control directly — home runs, walks, and strikeouts — removing defense and sequencing luck. When FIP is lower than ERA, the pitcher faced defensive headwinds and ERA should regress downward. In 2025, Yoshinobu Yamamoto's FIP (3.12) nearly matched his ERA (3.00), confirming genuine ace-level skill rather than lucky run sequencing. Below 3.00 is true ace territory for starters.

Player Examples (2025)

Yoshinobu Yamamoto3.12

Like FIP, but replaces actual home runs allowed with an expected HR count based on fly-ball rate. Strips out even more luck than FIP, making it a more stable long-term predictor of pitcher performance.

How many batters a pitcher would strike out per 9 innings. Higher means more swing-and-miss ability. 10+ is elite.

Player Examples (2025)

Yoshinobu Yamamoto10.8

How many walks a pitcher allows per 9 innings pitched. A control metric — lower is better. Below 3.0 signals solid command; below 2.0 is ace-level control.

A pitcher's strikeout rate minus their walk rate. Captures both dominance (K%) and control (BB%) in a single number. 10%+ is solid, 15%+ is ace-level. Yoshinobu Yamamoto consistently exceeds 20%.

How many home runs a pitcher allows per 9 innings. Lower is better. A key component of FIP. Fly-ball pitchers tend to post higher HR/9; ground-ball pitchers typically suppress it.

Percentage of batted balls classified as ground balls. Pitchers with high GB% suppress home runs and rely on their defense. 50%+ identifies a strong ground-ball pitcher. For batters, lower GB% generally produces more extra-base hits.

A refined version of xFIP that models interactions between strikeout rate, walk rate, and ground-ball rate. Widely regarded as one of the most reliable single-season ERA predictors. Produces less noise than ERA or xFIP and is better suited for long-term skill evaluation. Tracked by FanGraphs.

Percentage of swings that result in a miss. Higher is better for pitchers — a strong Whiff% signals elite pitch movement and deception. A whiff rate above 30% on a specific pitch is considered a true out-pitch. Best evaluated alongside K/9 and K-BB%.

The ultimate all-in-one stat. Estimates how many wins a player adds compared to a replacement-level player. Includes offense, defense, and baserunning. 5+ is All-Star level.

Player Examples (2025)

Shohei Ohtani10.5

Seiya Suzuki3.8

Masataka Yoshida2.1

Yoshinobu Yamamoto4.2

Expected batting average based on exit velocity and launch angle. Removes defensive influence to measure true hitting ability. When xBA exceeds AVG significantly, the batter has been unlucky; when AVG exceeds xBA, fortune has been favorable.

Calculated by Statcast from exit velocity and launch angle, xBA strips defensive luck from the equation. If xBA exceeds AVG, the batter is likely being hurt by sharp outfield play or bad luck and a rebound is expected. If AVG is much higher than xBA, fortune has been kind but may not last. In 2025, Ohtani's xBA (.330) exceeded his AVG (.310), suggesting his results could have been even stronger.

Expected wOBA based on exit velocity, launch angle, and sprint speed. Statcast's measure of true offensive quality. When xwOBA exceeds wOBA, the hitter has been unlucky; when wOBA exceeds xwOBA, fortune has been favorable.

Average speed of the ball off the bat, tracked by Statcast. 90+ mph is a good rate. A core measure of raw power — use it alongside Barrel% and Hard Hit% for a complete picture of contact quality.

The vertical angle at which the ball leaves the bat (-90 to 90 degrees). Optimal home-run range is roughly 15-35 degrees. Shohei Ohtani consistently hits in the ideal 15-20 degree range. Very low angles produce grounders; very high angles produce pop-ups.

A player's top running speed in feet per second during full-effort sprints, measured by Statcast. 30+ ft/s is top-tier MLB speed; 27 ft/s or below is below average. Also used to evaluate outfield range.

The number of rotations a pitch makes per minute (rpm), tracked by Statcast at release. Higher spin on fastballs creates a "rising" illusion that is harder to square up; higher spin on breaking balls amplifies movement. League averages vary by pitch type.

A Statcast defensive metric that measures how many outs a fielder records above or below what an average fielder would produce on comparable plays. Positive values indicate above-average range; +10 or more is Gold Glove territory. Applies to both infielders and outfielders.

A FanGraphs defensive metric that derives expected outs from batted-ball trajectory, velocity, and zone, then expresses the gap from an average fielder in runs saved (or lost). UZR is a long-standing peer to OAA, but this site publishes Statcast OAA / Fielding Runs Prevented as the primary defensive read — UZR is referenced here for context only.