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 1.014 — his third straight season above 1.000 — while Seiya Suzuki (.804) led other Japanese MLB hitters. For park-to-park comparisons, pair OPS with wRC+ or OPS+.

Player Examples (2025)

Shohei Ohtani1.014

Seiya Suzuki.804

Masataka Yoshida.695

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 1.014 OPS and .418 wOBA in 2025 — top of the NL once park effects are accounted for.

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 a .418 wOBA against Seiya Suzuki's .343 — a gap wide enough that no park adjustment changes the ranking. Use wRC+ when comparing players across different ballparks or eras.

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 a 1.014 OPS in 2025 — elite even before park adjustment.

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 .418 — 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. The MLB average is 8.6% (2025, per batted-ball event); 12%+ puts a hitter in the top 25% of qualified batters; 15%+ is elite. Shohei Ohtani's 23.5% Barrel rate in 2025 — among the highest in the Statcast era — was the primary engine behind his 55 home runs.

Player Examples (2025)

Shohei Ohtani23.5%

Seiya Suzuki16.6%

Masataka Yoshida6.5%

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

Player Examples (2025)

Shohei Ohtani.340

Seiya Suzuki.233

Masataka Yoshida.122

Percentage of batted balls hit at 95+ mph, tracked by Statcast. For batters, higher means more raw power — 40%+ is a good rate (Shohei Ohtani reached 58.7% in 2025). For pitchers, it measures hard contact allowed, so lower is better.

Player Examples (2025)

Shohei Ohtani58.7%

Seiya Suzuki48.7%

Masataka Yoshida44.0%

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 Ohtani15.0%

Seiya Suzuki10.9%

Masataka Yoshida4.9%

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. For batters, lower is better — 20% or below is elite plate discipline. From the pitcher's side, a pitch that induces a high chase rate is an elite put-away weapon. Used alongside BB% to evaluate pitch recognition.

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.

Total home runs hit. A counting stat that scales with playing time, so compare rates with AB/HR or ISO when judging raw power. For a qualified hitter, 30+ marks a middle-of-the-order bat and 40+ puts a player among the league's premier sluggers.

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 of 2.49 over 173.2 IP clears the qualified threshold, so the number is reliable. Sasaki's 4.46 over 36.1 IP and Ohtani's pitching ERA of 2.87 over 47.0 IP are small samples — read them as snapshots, not true talent.

Player Examples (2025)

Yoshinobu Yamamoto2.49

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 0.99, clearing the sub-1.00 bar (Roki Sasaki, limited to 36.1 innings by injury, finished at 1.43). 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 Yamamoto0.99

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 (2.93) nearly matched his ERA (2.49), confirming genuine ace-level skill rather than lucky run sequencing. Below 3.00 is true ace territory for starters.

Player Examples (2025)

Yoshinobu Yamamoto2.93

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 Yamamoto10.42

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. For pitchers, higher is better — a strong Whiff% signals elite pitch movement, and above 30% on a specific pitch marks a true out-pitch. For batters, lower is better, indicating strong contact ability. Best evaluated alongside K/9 and K-BB%.

Total batters retired by strikeout. A pure volume stat for pitchers — heavily influenced by innings pitched. For per-rate evaluation use K/9 (strikeouts per 9 IP) or K% (strikeout share of plate appearances). 200+ over a full starting season is elite-tier.

A starting pitcher outing of 6+ innings with 3 or fewer earned runs. Captures consistency across a season — a starter who logs 20+ QS in a year typically gives the bullpen a real break. The MLB benchmark for an ace-caliber season is roughly 22+ QS.

Awarded to the relief pitcher who finishes a winning game while protecting a small lead, under specific MLB rules (entering with the tying run on deck, or pitching 3+ innings of effective relief). The most common closer-only stat — 30+ in a season is the benchmark for an established closer.

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.

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 (.274) sat right on his AVG (.282) — his batting average was neither propped up by luck nor suppressed by defense.

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 defensive metric expressing how many runs a fielder saves relative to a league-average fielder at the same position. Zero is average; positive values mean runs prevented, and +10 or more is Gold Glove territory. Note: Baseball Savant does not publish DRS, so this site shows Fielding Runs Prevented — the same idea of converting defensive value into runs — as a DRS-equivalent figure.

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.