Center Back · Ajax · season-by-season, by competition, and every match.
A career still climbing — Baas is at his peak right now, and the curve hasn't flattened.
The record covers 6 seasons (2020/21–2025/26) across 3 clubs — 134 appearances with 20 goal contributions from defence.
His best campaign on record is 2025/26 at Ajax — Season rating 54, 4 goals and 1 assist in 33 games. 2024/25 was the leap — Season rating up 24 points at Ajax. Form is on a climb — up 27 Season points across his last 3 full seasons.
A streaky profile — form has swung hard between campaigns (spread of ±19 points), so the peak and the trough are far apart. Made the jump to a higher division in 2023/24 (Eredivisie) and kept playing — 28 games that season.
| Competition | Apps | Min | G | A | Rating |
|---|---|---|---|---|---|
| Eredivisie | 33 | 2945 | 4 | 1 | 7.2 |
| UEFA Champions League | 8 | 685 | 0 | 0 | 6.7 |
| UEFA U21 Championship - Qualification | 4 | 238 | 0 | 0 | — |
| KNVB Beker | 1 | 90 | 0 | 0 | 7.5 |
| Friendlies Clubs | 6 | 45 | 0 | 0 | 6.3 |
| Date | Competition | Opponent | Res | Status | Min | G | A | Rating |
|---|---|---|---|---|---|---|---|---|
| Jan 5 | Friendlies Clubs | A VfB Stuttgart | 2-2 | Played | 45 | 6.3 | ||
| Jul 12 | Friendlies Clubs | H Aarhus | 1-1 | Not in squad | — | |||
| Jul 16 | Friendlies Clubs | H PAOK | 2-1 | Not in squad | — | |||
| Jul 19 | Friendlies Clubs | H KV Mechelen | 3-2 | Not in squad | — | |||
| Jul 24 | Friendlies Clubs | H Celtic | 5-1 | Not in squad | — | |||
| Aug 3 | Friendlies Clubs | H Monaco | 2-2 | Not in squad | — | |||
| Aug 10 | Eredivisie | H Telstar | 2-0 | Played | 90 | 8.3 | ||
| Aug 17 | Eredivisie | A GO Ahead Eagles | 2-2 | Played | 90 | 1 | 6.9 | |
| Aug 24 | Eredivisie | H Heracles | 2-0 | Played | 90 | 8.0 | ||
| Aug 30 | Eredivisie | A FC Volendam | 1-1 | Played | 90 | 7.2 | ||
| Sep 13 | Eredivisie | H PEC Zwolle | 3-1 | Played | 90 | 7.3 | ||
| Sep 17 | UEFA Champions League | H Inter | 0-2 | Played | 90 | 7.3 | ||
| Sep 21 | Eredivisie | A PSV Eindhoven | 2-2 | Played | 90 | 7.0 | ||
| Sep 27 | Eredivisie | H NAC Breda | 2-1 | Not in squad | — | |||
| Sep 30 | UEFA Champions League | A Marseille | 0-4 | Played | 55 | 5.6 | ||
| Oct 4 | Eredivisie | A Sparta Rotterdam | 3-3 | Played | 90 | 7.2 | ||
| Oct 18 | Eredivisie | H AZ Alkmaar | 0-2 | Played | 90 | 7.5 | ||
| Oct 22 | UEFA Champions League | A Chelsea | 1-5 | Played | 90 | 5.9 | ||
| Oct 26 | Eredivisie | A Twente | 3-2 | Played | 90 | 6.9 | ||
| Nov 1 | Eredivisie | H Heerenveen | 1-1 | Played | 90 | 7.3 | ||
| Nov 5 | UEFA Champions League | H Galatasaray | 0-3 | Played | 90 | 6.2 | ||
| Nov 9 | Eredivisie | A Utrecht | 1-2 | Played | 90 | 6.7 | ||
| Nov 22 | Eredivisie | H Excelsior | 1-2 | Played | 90 | 7.6 | ||
| Nov 25 | UEFA Champions League | H Benfica | 0-2 | Played | 90 | 7.5 | ||
| Dec 2 | Eredivisie | H Groningen | 2-0 | Played | 90 | 6.9 | ||
| Dec 6 | Eredivisie | A Fortuna Sittard | 3-1 | Played | 60 | 6.3 | ||
| Dec 10 | UEFA Champions League | A Qarabag | 4-2 | Played | 90 | 6.9 | ||
| Dec 14 | Eredivisie | H Feyenoord | 2-0 | Suspended | — | |||
| Dec 17 | KNVB Beker | A Excelsior Maassluis | 7-2 | Played | 90 | 7.5 | ||
| Dec 20 | Eredivisie | A NEC Nijmegen | 2-2 | Played | 90 | 6.7 | ||
| Jan 11 | Eredivisie | A Telstar | 3-2 | Played | 90 | 1 | 1 | 7.9 |
| Jan 14 | KNVB Beker | A AZ Alkmaar | 0-6 | Not in squad | — | |||
| Jan 17 | Eredivisie | H GO Ahead Eagles | 2-2 | Not in squad | — | |||
| Jan 20 | UEFA Champions League | A Villarreal | 2-1 | Played | 90 | 7.2 | ||
| Jan 24 | Eredivisie | H FC Volendam | 2-0 | Played | 90 | 2 | 9.3 | |
| Jan 28 | UEFA Champions League | H Olympiakos Piraeus | 1-2 | Played | 90 | 6.9 | ||
| Feb 1 | Eredivisie | A Excelsior | 2-2 | Played | 90 | 7.2 | ||
| Feb 8 | Eredivisie | A AZ Alkmaar | 1-1 | Played | 90 | 7.3 | ||
| Feb 14 | Eredivisie | H Fortuna Sittard | 4-1 | Played | 90 | 7.2 | ||
| Feb 21 | Eredivisie | H NEC Nijmegen | 1-1 | Played | 90 | 6.3 | ||
| Mar 1 | Eredivisie | A PEC Zwolle | 0-0 | Played | 90 | 7.2 | ||
| Mar 7 | Eredivisie | A Groningen | 1-3 | Played | 90 | 6.7 | ||
| Mar 14 | Eredivisie | H Sparta Rotterdam | 4-0 | Played | 90 | 6.9 | ||
| Mar 22 | Eredivisie | A Feyenoord | 1-1 | Played | 90 | 6.2 | ||
| Apr 4 | Eredivisie | H Twente | 1-2 | Played | 90 | 7.3 | ||
| Apr 11 | Eredivisie | A Heracles | 3-0 | Played | 90 | 7.9 | ||
| Apr 25 | Eredivisie | A NAC Breda | 2-0 | Played | 90 | 7.9 | ||
| May 2 | Eredivisie | H PSV Eindhoven | 2-2 | Played | 90 | 6.2 | ||
| May 10 | Eredivisie | H Utrecht | 1-2 | Played | 90 | 6.5 | ||
| May 17 | Eredivisie | A Heerenveen | 0-0 | Played | 90 | 7.2 | ||
| May 21 | Eredivisie | H Groningen | 2-0 | Played | 90 | 7.0 | ||
| May 24 | Eredivisie | H Utrecht | 0-0 | Played | 95 | 8.2 |