| Challenger Fairfield | 10/15 18:00 | 28 | Michael Mmoh v Sam Riffice | 6-4,6-4 | |
| Challenger Fairfield | 10/14 17:00 | 27 | Alexis Galarneau v Sam Riffice | 4-6,6-7 | |
| Challenger Fairfield | 10/12 18:45 | 26 | Christian Langmo v Sam Riffice | 7-6,3-6,4-6 | |
| Challenger Fairfield | 10/11 18:20 | 25 | Sam Riffice v Stefan Kozlov | 3-6,6-2,6-3 | |
| Challenger Fairfield | 10/10 17:00 | 19 | Ezekiel Clark v Sam Riffice | 7-5,5-7,3-6 | |
| Challenger Fairfield | 10/09 19:35 | 14 | Sam Riffice v Jack Pinnington Jones | 6-3,6-4 | |
| Challenger Tiburon | 10/05 21:05 | 26 | Ben Shelton v Sam Riffice | 6-3,6-2 | |
| Challenger Tiburon | 10/04 17:00 | 25 | Sam Riffice v Evan King | 6-7,7-5,6-1 | |
| ITF M15 Fayetteville | 09/25 14:55 | 29 | Sam Riffice v Blu Baker | Retired | |
| ITF M15 Fayetteville | 09/24 15:00 | 28 | Sam Riffice v Radu Mihai Papoe | 6-3,6-0 | |
| ITF M15 Fayetteville | 09/23 17:15 | 27 | Jack Pinnington Jones v Sam Riffice | 6-4,2-6,3-6 | |
| ITF M15 Fayetteville | 09/22 21:50 | 26 | Benito Sanchez Martinez v Sam Riffice | 1-6,3-6 |
Sam Riffice (born 1 March 1999) is an American tennis player.
Riffice was given his ATP tour debut as a wildcard at the 2021 US Open, where he lost in the first round to 15th seed Grigor Dimitrov.