| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2023 | Ettan: North | 6 | 126 | 0 | 0 | 0 | — |
| 2024 | Ettan: North | 20 | 1383 | 0 | 0 | 0 | — |
| 2025 | Ettan: South | 22 | 1776 | 2 | 0 | 0.1 | 6.56 |
| 2026 | Ettan: South | 5 | 324 | 0 | 0 | 0 | 6.31 |
Domestic league competitions only (SportMonks sub_type='domestic'); national-team, continental and cup competitions are excluded. Classification resolved by league id against the canonical leagues index. G+A/90 computed from minutes actually played.
Figures computed from the GioScore season-stats database · as of 2026-07-29
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Piteå | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
 Assyriska | 2 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
 Jönköpings Södra | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Husqvarna | 2 | 2 | 0 | 0 | 1 | 0 | 0 | 0 |
 Sollentuna | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Norrby | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 FBK Karlstad | 2 | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
 Friska Viljor | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Hässleholms IF | 2 | 0 | 0 | 2 | 0 | 0 | 0 | 0 |
 Stockholm Internazionale | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 United Nordic | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 0 |
 Hammarby Talang | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
 Ljungskile | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 |
 Oskarshamns AIK | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Trelleborg | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Vasalund | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
 Lund | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
 Rosengård | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Umeå | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
 Örebro Syrianska | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
William Sonntag went through 5 Ettan: South appearances in 2026 (324 minutes) without a goal or an assist. His average match rating for that season computes to 6.31.
His league record spans 4 seasons (2023–2026) across 3 clubs. His best-rated season remains 2025 (6.56, Ettan: South); his lowest was 2026 (6.31).
