Kostas Papanikolaou

Olympiacos Piraeus

Power forward 204 cm GRE 36 yr #16
-5.0 Predictability score 21 games started, 2025-26
Season 2025-26 season backtest

Projected vs actual profile

Season averages, axes scaled to an elite Euroleague starter level.

Model vs naive baseline

The naive forecaster projects the average of season and last-5 games. We publish the comparison for every stat, whichever side wins.

StatSkillAvgModel MAENaive MAE
Points +15.8% 3.62 3.26 3.3
Rebounds +7.4% 2.0 1.0 1.1
Assists -3.1% 2.05 1.11 1.08
3PM +8.4% 0.95 0.84 0.87
PIR -38.3% 2.81 4.93 3.6

Skill = CRPS improvement of the full probability distribution over a naive rolling average, per game, measured on the same games. The dotted stats (points, rebounds, PIR) drive the headline score; assists and threes are shown for transparency.

Game by game: predicted vs actual

The shaded band is the model's 10th to 90th percentile before tip-off. Dots are what he actually did.

Every game he started

DateOpponent PointsReboundsAssists3PMPIR
2026-05-24 vs Real Madrid 0 (3.6) 0 (1.9) 0 (1.2) 0 (1.0) -3 (6.0)
2026-05-22 vs Fenerbahce Istanbul 0 (3.7) 2 (1.9) 1 (1.0) 0 (0.9) -1 (6.0)
2026-05-05 @ AS Monaco 6 (4.0) 3 (1.9) 4 (1.5) 2 (1.3) 11 (6.5)
2026-04-30 vs AS Monaco 6 (4.1) 3 (1.9) 3 (1.4) 2 (1.3) 7 (7.0)
2026-04-09 @ Hapoel Tel Aviv 9 (3.6) 2 (1.9) 1 (1.6) 3 (1.1) 8 (6.0)
2026-04-07 vs Real Madrid 3 (4.2) 1 (1.7) 3 (1.0) 1 (1.1) 2 (6.3)
2026-04-03 @ ASVEL Villeurbanne 0 (4.4) 2 (1.8) 1 (1.4) 0 (0.9) -2 (7.1)
2026-03-24 @ Valencia Basket 0 (4.1) 0 (1.8) 1 (1.2) 0 (1.0) -4 (6.3)
2026-03-17 vs Fenerbahce Istanbul 0 (4.6) 0 (2.1) 1 (1.5) 0 (0.9) 0 (7.1)
2026-03-12 @ AS Monaco 5 (4.9) 1 (2.0) 0 (2.1) 1 (1.2) 0 (7.5)
2026-03-10 @ Paris Basketball 0 (4.8) 3 (2.2) 2 (2.1) 0 (1.2) 0 (7.9)
2026-03-06 vs Panathinaikos Athens 8 (5.5) 2 (2.1) 1 (2.2) 2 (1.3) 5 (8.3)
2026-01-22 @ Anadolu Efes Istanbul 2 (5.3) 4 (2.1) 3 (2.0) 0 (1.3) 4 (8.5)
2026-01-20 vs Maccabi Tel Aviv 0 (6.2) 1 (2.3) 3 (2.2) 0 (1.6) 0 (9.2)
2026-01-14 @ Partizan Belgrade 3 (5.6) 5 (2.2) 2 (1.9) 1 (1.3) 2 (8.5)
2026-01-09 vs FC Bayern Munich 10 (5.1) 2 (2.1) 4 (1.7) 2 (1.2) 9 (7.9)
2026-01-06 @ Fenerbahce Istanbul 0 (4.2) 2 (1.8) 2 (1.3) 0 (1.0) 1 (6.6)
2026-01-02 @ Panathinaikos Athens 8 (4.5) 2 (1.9) 2 (1.6) 2 (1.2) 3 (6.1)
2025-12-26 @ Virtus Bologna 5 (3.8) 4 (1.6) 2 (1.5) 1 (0.9) 6 (5.9)
2025-12-19 vs ASVEL Villeurbanne 5 (3.7) 1 (1.8) 3 (0.9) 1 (0.8) 5 (6.2)
2025-12-16 vs Valencia Basket 6 (3.2) 2 (1.7) 4 (0.9) 2 (0.8) 6 (5.6)

Bold = actual, in brackets = model projection before the game. Only games he started are shown: our projections assume the starting five, so a scratch is not a model miss.

About this data

The 2025-26 season is a holdout backtest: the models were trained on Euroleague seasons up to 2022-23 and tuned on 2023-24, then predicted every 2025-26 game. The season is fully out-of-sample, with one caveat: historical features use realized lineups, while live production predicts from the expected starting five, so live accuracy can run marginally lower. PIR is the Euroleague's own performance index rating, the competition's summary number for a player's game, and the only projected stat here that can be negative. Projections and full distributions for today's games are on the Euroleague player projections page, team rating profiles on Euroleague team profiles, and the methodology behind every model on the methodology page.