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JunYong Park

Middleweight · REAL v1.0 (registered) #35; v1.1 (shadow) #37

Descriptive profile. The resume rank is what has been earned; these statistics are context, not a prediction. A test on Oct 20, 2026 found that career statistics add nothing reliable to age, layoff and experience as predictors of the next result (experiments/REGISTER.md, EXP-2026-10-20-14).

Weight band 30-36: the 10th to 90th percentile of his position across weight vectors drawn near the 70/30 weights. Rating 1,570, deviation 127: measured from 13 UFC bouts; a one-bout newcomer sits near 290.

Age 35 (born 1991-02-27) · Height 5 ft 10 in (178 cm) · Reach 73 in (185 cm) · Stance Orthodox · 372 days since last bout (2025-10-25) · Last five 3-2 · Streak L1

Why he is ranked here

Rating 1,570 is the division's 35th highest of 79 board fighters after an inactivity penalty of 2 points for 372 days without a bout; the ledger stands at -1.8 (+0.2 from quality wins, less 1.0 for blowout losses, less 1.0 for other losses outside the top 5; losses count for three years); 1 quality win in 15 years, 0 over top-10 opponents; no form penalty (3-2 last five). Score +0.03 = +0.07 (rating term, 70% weight) -0.04 (ledger term, 30% weight) -0.00 (form penalty); score order put him at #35.

TermValueDetail
Score+0.0370% rating term + 30% ledger term - form penalty
Rating term+0.07resume rating 1,570 (raw 1,572 less inactivity penalty 2), scaled against the division's interdecile range
Ledger term-0.04quality ledger -1.8: +0.2 QW +0.0 proof -1.0 blowout -1.0 weak
Form penalty0.00last five 3-2
Quality wins, 15 years10 over top-10 opponents, 0 over top-15
Placementscore order #35v1.0 (registered)
Shadow board v1.1#37score -0.17; score order #37

Rules, weights and worked examples: methodology.

Last ten bouts

DateEventOpponentOpp. official rankResultMethodRoundModel p
2025-10-25UFC 321: Aspinall vs. GaneIkram AliskerovunrankedLunanimous decision3 (5:00)38%
2025-06-21UFC Fight Night: Hill vs. Rountree Jr.Ismail NaurdievunrankedWunanimous decision3 (5:00)63%
2024-10-12UFC Fight Night: Royval vs. TairaBrad TavaresunrankedWsplit decision3 (5:00)61%
2023-12-09UFC Fight Night: Song vs. GutierrezAndre MunizunrankedLsplit decision3 (5:00)56%
2023-07-15UFC Fight Night: Holm vs. Bueno SilvaAlbert DuraevunrankedWsubmission2 (4:45)61%
2023-02-04UFC Fight Night: Lewis vs. SpivacDenis TiuliulinunrankedWsubmission1 (4:05)63%
2022-10-29UFC Fight Night: Kattar vs. AllenJoseph HolmesunrankedWsubmission2 (3:04)52%
2022-05-21UFC Fight Night: Holm vs. VieiraEryk AndersunrankedWsplit decision3 (5:00)54%
2021-10-23UFC Fight Night: Costa vs. VettoriGregory RodriguesunrankedLKO/TKO2 (3:13)55%
2021-05-08UFC Fight Night: Rodriguez vs. WatersonTafon NchukwiunrankedWmajority decision3 (5:00)45%

Opp. official rank = the UFC media-panel rank of the opponent on the date (C champion, #1 to #15, unranked; n/a before Feb 2013 or where no official board existed). Model p = the predictive model's pre-fight win chance for him (frozen performance-adjusted Elo; bouts before 2020 were in its tuning sample). Linked opponents have a profile.

Career statistics

Through 2026-10-31, UFC bouts only. Percentile = share of the 79 board fighters at Middleweight at or below this value; high is a position in the division, not a verdict.

Output
Significant strikes landed per minute4.64(70th percentile at Middleweight)
Significant strike accuracy52%(61st percentile at Middleweight)
Knockdowns scored per 15 minutes0.09(33rd percentile at Middleweight)
Share of wins by finish33%(24th percentile at Middleweight)
Defence and damage
Significant strikes absorbed per minute3.82(65th percentile at Middleweight)
Significant strike defence51%(49th percentile at Middleweight)
Knockdowns suffered per 15 minutes0.00(34th percentile at Middleweight)
Significant strikes absorbed, career611(81st percentile at Middleweight)
KO/TKO losses1 (last 2021-10-23, 1,835 days ago)(65th percentile at Middleweight)
Submission losses1(87th percentile at Middleweight)
KO/TKO losses per bout over 10 years, each weighted down by the finisher's danger0.046(47th percentile at Middleweight)
Grappling
Takedowns landed per 15 minutes1.69(63rd percentile at Middleweight)
Takedown defence55%(31st percentile at Middleweight)
Share of cage time in control30%(73rd percentile at Middleweight)
Share of significant strikes landed in the clinch or on the ground16%(41st percentile at Middleweight)
Stylemixed (3.9 takedown attempts per 15 min; 30% control)
Career stage
Age35.7(77th percentile at Middleweight)
Age at UFC debut28.5(49th percentile at Middleweight)
Years since UFC debut7.2(81st percentile at Middleweight)
UFC bouts13(80th percentile at Middleweight)
Cage time, minutes160(81st percentile at Middleweight)
Bouts per year, last three years1.3(28th percentile at Middleweight)
Days since last bout372(95th percentile at Middleweight)

Board position since Oct 2023

C1020304020252026Oct 2023Oct 20262023-10-06: #21, Middleweight2023-10-13: #21, Middleweight2023-10-20: #21, Middleweight2023-11-03: #22, Middleweight2023-11-10: #22, Middleweight2023-11-17: #22, Middleweight2023-12-01: #21, Middleweight2023-12-08: #21, Middleweight2023-12-15: #27, Middleweight2024-01-12: #26, Middleweight2024-01-19: #26, Middleweight2024-02-02: #26, Middleweight2024-02-09: #26, Middleweight2024-02-16: #25, Middleweight2024-02-23: #25, Middleweight2024-03-01: #24, Middleweight2024-03-08: #25, Middleweight2024-03-15: #26, Middleweight2024-03-22: #26, Middleweight2024-03-29: #26, Middleweight2024-04-05: #28, Middleweight2024-04-12: #28, Middleweight2024-04-26: #28, Middleweight2024-05-03: #28, Middleweight2024-05-10: #28, Middleweight2024-05-17: #27, Middleweight2024-05-31: #27, Middleweight2024-06-07: #27, Middleweight2024-06-14: #27, Middleweight2024-06-21: #27, Middleweight2024-06-28: #26, Middleweight2024-07-12: #26, Middleweight2024-07-19: #27, Middleweight2024-07-26: #27, Middleweight2024-08-02: #26, Middleweight2024-08-09: #26, Middleweight2024-08-16: #27, Middleweight2024-08-23: #27, Middleweight2024-09-06: #27, Middleweight2024-09-13: #27, Middleweight2024-09-27: #27, Middleweight2024-10-04: #27, Middleweight2024-10-11: #29, Middleweight2024-10-18: #24, Middleweight2024-10-25: #22, Middleweight2024-11-01: #24, Middleweight2024-11-08: #24, Middleweight2024-11-15: #22, Middleweight2024-11-22: #22, Middleweight2024-12-06: #22, Middleweight2024-12-13: #21, Middleweight2025-01-10: #21, Middleweight2025-01-17: #23, Middleweight2025-01-31: #23, Middleweight2025-02-07: #22, Middleweight2025-02-14: #22, Middleweight2025-02-21: #23, Middleweight2025-02-28: #24, Middleweight2025-03-07: #24, Middleweight2025-03-14: #24, Middleweight2025-03-21: #25, Middleweight2025-03-28: #25, Middleweight2025-04-04: #23, Middleweight2025-04-11: #23, Middleweight2025-04-25: #24, Middleweight2025-05-02: #25, Middleweight2025-05-09: #24, Middleweight2025-05-16: #24, Middleweight2025-05-30: #24, Middleweight2025-06-06: #24, Middleweight2025-06-13: #24, Middleweight2025-06-20: #24, Middleweight2025-06-27: #18, Middleweight2025-07-11: #18, Middleweight2025-07-18: #18, Middleweight2025-07-25: #17, Middleweight2025-08-01: #17, Middleweight2025-08-08: #17, Middleweight2025-08-15: #17, Middleweight2025-08-22: #18, Middleweight2025-09-05: #18, Middleweight2025-09-12: #18, Middleweight2025-09-26: #19, Middleweight2025-10-03: #19, Middleweight2025-10-10: #19, Middleweight2025-10-17: #19, Middleweight2025-10-24: #19, Middleweight2025-10-31: #31, Middleweight2025-11-07: #31, Middleweight2025-11-14: #30, Middleweight2025-11-21: #29, Middleweight2025-12-05: #30, Middleweight2025-12-12: #31, Middleweight2026-01-23: #31, Middleweight2026-01-30: #32, Middleweight2026-02-06: #33, Middleweight2026-02-20: #32, Middleweight2026-02-27: #32, Middleweight2026-03-06: #33, Middleweight2026-03-13: #31, Middleweight2026-03-20: #31, Middleweight2026-03-27: #30, Middleweight2026-04-03: #29, Middleweight2026-04-10: #28, Middleweight2026-04-17: #27, Middleweight2026-04-24: #28, Middleweight2026-05-01: #27, Middleweight2026-05-08: #27, Middleweight2026-05-15: #27, Middleweight2026-05-29: #27, Middleweight2026-06-05: #28, Middleweight2026-06-13: #28, Middleweight2026-06-19: #28, Middleweight2026-06-26: #28, Middleweight2026-07-10: #28, Middleweight2026-07-17: #29, Middleweight2026-07-24: #28, Middleweight2026-07-31: #28, Middleweight2026-08-07: #28, Middleweight2026-08-14: #28, Middleweight2026-08-21: #30, Middleweight2026-08-28: #31, Middleweight2026-09-04: #31, Middleweight2026-09-11: #31, Middleweight2026-09-18: #31, Middleweight2026-09-25: #31, Middleweight2026-09-26: #31, Middleweight2026-10-03: #32, Middleweight2026-10-10: #32, Middleweight2026-10-17: #34, Middleweight2026-10-24: #34, Middleweight2026-10-31: #35, Middleweight#35

Position on the registered v1.0 board at each weekly snapshot (C = title holder or reserved, drawn at the top; lower is better).

Predictive rating by bout

1,4501,5001,5501,6001,65020212022202320242025Aug 2019Oct 20262019-08-31: 1,487 (L vs Anthony Hernandez)2019-12-21: 1,550 (W vs Marc-Andre Barriault)2020-10-17: 1,556 (W vs John Phillips)2021-05-08: 1,596 (W vs Tafon Nchukwi)2021-10-23: 1,530 (L vs Gregory Rodrigues)2022-05-21: 1,553 (W vs Eryk Anders)2022-10-29: 1,575 (W vs Joseph Holmes)2023-02-04: 1,618 (W vs Denis Tiuliulin)2023-07-15: 1,647 (W vs Albert Duraev)2023-12-09: 1,624 (L vs Andre Muniz)2024-10-12: 1,646 (W vs Brad Tavares)2025-06-21: 1,629 (W vs Ismail Naurdiev)2025-10-25: 1,613 (L vs Ikram Aliskerov)1,613

Rating after each UFC bout from the frozen predictive model (performance-adjusted Elo, data/processed/elo_history.csv; a debut starts at 1,500). The resume rating's history is not stored, so this is the predictive line, which is a different number from the resume rating in the header.

Trajectory

Recent performances run about 34 points behind the rating: fighters this age typically run 49 points behind their rating, and his own recent results recover 15 of those points.

ComponentPointsMeaning
Age component-49what fighters aged 35.7 typically run relative to their rating (population curve, all UFC bouts since 2011)
Own recent results+15his recency-weighted mean and trend over 13 bouts, shrunk toward zero; trend +0 points a year
Combined-34the rating's likely distance from his current performance level, in rating points
Readingbehind ratingahead of, in line with (within 30 points), or behind the rating

Performance relative to the rating, by age

-1.0-0.5+0.0+0.5+1.0282930313233343536372019-08-31 (age 28.5): L vs Anthony Hernandez, residual -0.602019-12-21 (age 28.8): W vs Marc-Andre Barriault, residual +0.292020-10-17 (age 29.6): W vs John Phillips, residual +0.232021-05-08 (age 30.2): W vs Tafon Nchukwi, residual +0.282021-10-23 (age 30.7): L vs Gregory Rodrigues, residual -0.532022-05-21 (age 31.2): W vs Eryk Anders, residual +0.222022-10-29 (age 31.7): W vs Joseph Holmes, residual +0.572023-02-04 (age 31.9): W vs Denis Tiuliulin, residual +0.422023-07-15 (age 32.4): W vs Albert Duraev, residual +0.442023-12-09 (age 32.8): L vs Andre Muniz, residual -0.082024-10-12 (age 33.6): W vs Brad Tavares, residual +0.162025-06-21 (age 34.3): W vs Ismail Naurdiev, residual +0.192025-10-25 (age 34.7): L vs Ikram Aliskerov, residual -0.35-0.05

Each dot is one decided UFC bout at his age then: the performance score minus the rating's expectation, on the score's own scale from -1 to +1 (filled = win, hollow = loss; above zero is better than the rating implied; a finish as a slight favourite is about +0.45). The dashed line is the population curve for all fighters; the solid line is this fighter's own fitted level and trend as of the data date, weighted toward recent bouts. One unit sustained over many bouts corresponds to about 695 rating points; a single bout's residual is noisy.

Held-out evidence (walk-forward 2016 to 2026, EXP-2026-10-21-01): the age curve held in every test year; the individual component is a weak signal (correlation 0.06 with the next bout's residual; among fighters aged 33 or over, the lowest predicted quartile won 38% of next bouts against 53% expected, the highest 48% against 52%) and adds nothing to bout prediction beyond the shadow model. No board uses any of it: the rankings answer who has earned the place, not who wins next (EXP-2026-10-20-09). Method: src/mmalab/decline.py; settings: config/decline.yaml (expectation from the resume rating; one unit of residual is about 695 rating points).

Context flags

Descriptive only. Each line is a population fact about fighters like him, not a forecast for him; the register entries hold the measurements.

REAL v1.0 (registered method) · build c166ee8 · data through 2026-10-31 · page built 2026-11-06 · changelog. Independent fan research project built on public UFCStats data. Not affiliated with, sponsored or endorsed by UFC, Zuffa, LLC, TKO Group Holdings, or any athlete. All trademarks belong to their owners and are used only to identify athletes and events.