William Byron at Martinsville
William Byron has made 17 NASCAR Cup Series starts at Martinsville since 2018, with 3 wins, 10 top 10s and an average finish of 12.6.
Totals at Martinsville by series
| Series | Starts | Wins | Top 5 | Top 10 | Laps led | Avg finish | Avg start | Best finish |
|---|
| Cup Series | 17 | 3 | 7 | 10 | 670 | 12.6 | 12.1 | 1 |
| Truck Series | 2 | 1 | 1 | 1 | 94 | 7.5 | 22.5 | 1 |
Every start at Martinsville
| Date | Race | Series | Start | Finish | Laps led | Status |
|---|
| March 29, 2026 | 2026 Cook Out 400 | Cup Series | 2 | 5 | 6 | Running |
| October 26, 2025 | 2025 Xfinity 500 | Cup Series | 1 | 1 | 304 | Running |
| March 30, 2025 | 2025 Cook Out 400 | Cup Series | 10 | 22 | 0 | Running |
| March 28, 2025 | 2025 Martinsville, March 28 | Truck Series | 13 | 14 | 0 | Running |
| November 3, 2024 | 2024 XFINITY 500 | Cup Series | 3 | 6 | 51 | Running |
| April 7, 2024 | 2024 Cook Out 400 | Cup Series | 18 | 1 | 88 | Running |
| October 29, 2023 | 2023 Xfinity 500 | Cup Series | 16 | 13 | 0 | Running |
| April 16, 2023 | 2023 NOCO 400 | Cup Series | 8 | 23 | 0 | Running |
| October 30, 2022 | 2022 Xfinity 500 | Cup Series | 25 | 7 | 0 | Running |
| April 9, 2022 | 2022 Blue-Emu Maximum Pain Relief 400 | Cup Series | 5 | 1 | 212 | Running |
| April 7, 2022 | 2022 Blue Emu Maximum Pain Relief 200 | Truck Series | 32 | 1 | 94 | Running |
| October 31, 2021 | 2021 Xfinity 500 | Cup Series | 11 | 5 | 0 | Running |
| April 10, 2021 | 2021 Blue-Emu Maximum Pain Relief 500 | Cup Series | 3 | 4 | 9 | Running |
| November 1, 2020 | 2020 Xfinity 500 | Cup Series | 13 | 35 | 0 | Accident |
| June 10, 2020 | 2020 Blue-Emu Maximum Pain Relief 500 | Cup Series | 15 | 8 | 0 | Running |
| October 27, 2019 | 2019 First Data 500 | Cup Series | 11 | 2 | 0 | Running |
| March 24, 2019 | 2019 STP 500 | Cup Series | 34 | 22 | 0 | Running |
| October 28, 2018 | 2018 First Data 500 | Cup Series | 11 | 39 | 0 | Accident |
| March 26, 2018 | 2018 STP 500 | Cup Series | 20 | 20 | 0 | Running |