| Season | League | Apps | Min | Goals | Assists | G+A / 90 | Rating |
|---|---|---|---|---|---|---|---|
| 2019 | USL Championship (United States) | 5 | 111 | 0 | 0 | 0 | — |
| 2020 | USL Championship (United States) | 10 | 318 | 0 | 1 | 0.28 | 6.77 |
| 2021 | USL Championship (United States) | 33 | 2348 | 1 | 0 | 0.04 | 7 |
| 2022 | USL Championship (United States) | 21 | 878 | 0 | 3 | 0.31 | 6.95 |
| 2023 | USL Championship (United States) | 33 | 2737 | 3 | 5 | 0.26 | 7.04 |
| 2024 | USL Championship (United States) | 29 | 2465 | 1 | 7 | 0.29 | 7.22 |
| 2025 | USL Championship (United States) | 28 | 1719 | 2 | 1 | 0.16 | 6.73 |
| 2026 | USL Championship (United States) | 5 | 143 | 0 | 0 | 0 | 6.4 |
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 2026-08-13
Player stats against each opponent club
| Team | MP | W | D | L | G | A | ||
|---|---|---|---|---|---|---|---|---|
 Phoenix Rising | 7 | 0 | 4 | 3 | 0 | 0 | 4 | 0 |
 Sacramento Republic | 5 | 2 | 0 | 3 | 0 | 2 | 1 | 0 |
 Las Vegas Lights | 5 | 2 | 1 | 2 | 0 | 0 | 1 | 0 |
 Orange County | 4 | 1 | 1 | 2 | 0 | 0 | 1 | 0 |
 Colorado Springs | 4 | 0 | 2 | 2 | 0 | 0 | 1 | 0 |
 Tulsa Roughnecks | 4 | 1 | 2 | 1 | 0 | 0 | 2 | 0 |
 New Mexico United | 4 | 2 | 0 | 2 | 0 | 1 | 1 | 0 |
 Ventura County | 3 | 1 | 0 | 2 | 1 | 0 | 1 | 0 |
 San Antonio | 3 | 0 | 0 | 3 | 0 | 0 | 0 | 0 |
 Miami FC II | 3 | 1 | 2 | 0 | 1 | 0 | 0 | 0 |
 Hartford Athletic | 3 | 2 | 0 | 1 | 0 | 0 | 0 | 0 |
 Memphis 901 | 3 | 0 | 3 | 0 | 0 | 1 | 1 | 0 |
 Loudoun United | 3 | 1 | 0 | 2 | 0 | 0 | 1 | 0 |
 San Diego Loyal | 3 | 2 | 0 | 1 | 0 | 0 | 0 | 0 |
 Monterey Bay | 3 | 1 | 1 | 1 | 0 | 1 | 1 | 0 |
 Tampa Bay Rowdies | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 0 |
 Indy Eleven | 2 | 2 | 0 | 0 | 0 | 0 | 1 | 0 |
 Charleston Battery | 2 | 0 | 1 | 1 | 0 | 0 | 1 | 0 |
 El Farolito | 2 | 2 | 0 | 0 | 1 | 0 | 2 | 0 |
 Birmingham Legion | 2 | 1 | 0 | 1 | 0 | 1 | 0 | 0 |
In the 2026 USL Championship (United States), Guillermo Diaz played 5 games (143 minutes) without a direct goal contribution. That season graded out at an average match rating of 6.4.
The record shows 8 league seasons for him (2019–2026) across 2 clubs. His ratings range from 6.4 (2026) up to 7.22 in 2024, USL Championship (United States). His last two rated seasons average 0.43 below his earlier career level.
