Mortimer John Roberts
Birthplace: Philadelphia, Pennsylvania
Born: June 7, 1887
Died: August 12, 1955
Mortimer Roberts
Mortimer John Roberts
Birthplace: Philadelphia, Pennsylvania
Born: June 7, 1887
Died: August 12, 1955
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| Track | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Cincinnati-RC | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Elgin | 4 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | |
| Indianapolis | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Long Island | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | |
| Milwaukee-RC | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| Chassis | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Abbott-Detroit | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | |
| Mason | 3 | 1 | 1 | 0 | 0 | 2 | 0 | 0 | |
| Pope-Hartford | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Robinson | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
| Engine | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Abbott-Detroit | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | |
| Mason | 3 | 1 | 1 | 0 | 0 | 2 | 0 | 0 | |
| Pope-Hartford | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Wisconsin | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |