Zachary Svajda ( ; born November 29, 2002) is an American professional tennis player. He has a career-high ATP singles ranking of world No. 102, achieved on 26 August 2024 and a doubles ranking of No. 664, achieved on 8 August 2022.
He earned his first ATP World Tour ranking point at the age of 15, defeating top-seeded João Lucas Reis da Silva of Brazil 6–3, 6–4 at the 2018 Claremont Club Pro Classic as a local main-draw wildcard.
In July, he qualified for the main draw of the 2024 Hall of Fame Open and for the 2024 Atlanta Open but lost in the first rounds. He also entered the main draw at the 2024 Mubadala Citi DC Open in Washington as a lucky loser but lost to wildcard J. J. Wolf.
In August, he received a wildcard for the main draw of the 2024 US Open. He again entered the main draw of the 2024 Winston-Salem Open as a lucky loser and defeated Laslo Djere in the first round and upset third seed Francisco Cerúndolo in the second, getting his revenge for the first round loss at the 2023 US Open, a year earlier. As a result he reached No. 102 in the singles rankings on 26 August 2024.
| Australian Open | A | A | A | A | A | Q2 | Q2 | 1R | 0 / 1 | 0–1 | |
| French Open | A | A | A | A | Q1 | Q2 | Q2 | 0 / 0 | 0–0 | ||
| Wimbledon | A | NH | A | A | Q2 | Q2 | Q2 | 0 / 0 | 0–0 | ||
| US Open | 1R | A | 2R | Q2 | 1R | 1R | 2R | 0 / 5 | 2–5 | ||
| Win–loss | 0–1 | 0–0 | 1–1 | 0–0 | 0–1 | 0–1 | 1–1 | 0–1 | 0 / 6 | 2–6 | |
| ATP Masters 1000 | |||||||||||
| Indian Wells Masters | A | NH | 1R | A | Q2 | Q2 | Q1 | 0 / 1 | 0–1 | ||
| Miami Open | A | NH | A | A | A | Q1 | A | 0 / 0 | 0–0 | ||
| Monte Carlo Masters | A | NH | A | A | A | A | A | 0 / 0 | 0–0 | ||
| Madrid Open | A | NH | A | A | A | Q1 | A | 0 / 0 | 0–0 | ||
| Italian Open | A | A | A | A | A | A | A | 0 / 0 | 0–0 | ||
| Canadian Open | A | NH | A | A | A | A | A | 0 / 0 | 0–0 | ||
| Cincinnati Open | A | A | A | A | A | Q2 | Q1 | 0 / 0 | 0–0 | ||
| Shanghai Masters | A | NH | A | 2R | A | 0 / 1 | 1–1 | ||||
| Paris Masters | A | A | A | A | A | A | A | 0 / 0 | 0–0 | ||
| Win–loss | 0–0 | 0–0 | 0–1 | 0–0 | 0–0 | 1–1 | 0–0 | 0–0 | 0 / 2 | 1–2 | |
| {class="wikitable" style=font-size:97% !Legend |
| ATP Challenger Tour (7–1) |
| ITF WTT (3–0) |
| Hard (9–1) |
| Clay (0–0) |
| Grass (1–0) |
| Win | 1–0 | Tiburon Challenger, US | Challenger | Hard | Ben Shelton | 2–6, 6–2, 6–4 | |
| Win | 2–0 | Cary Challenger, US | Challenger | Hard | Rinky Hijikata | 7–6(7–3), 4–6, 6–1 | |
| Win | 3–0 | Tiburon Challenger, US (2) | Challenger | Hard | Adam Walton | 6–2, 6–2 | |
| Win | 4–0 | Fairfield Challenger, US | Challenger | Hard | Nishesh Basavareddy | 6–4, 6–1 | |
| Loss | 4–1 | Southern California Open, US | Challenger | Hard | Blaise Bicknell | 3–6, 2–6 | |
| Win | 5–1 | Hall of Fame Open, US | Challenger | Grass | Adrian Mannarino | 7–5, 6–3 | |
| Win | 6–1 | Lexington Open, US | Challenger | Hard | Bernard Tomic | 2–6, 6–3, 6–2 | |
| Win | 7–1 | San Diego Open, US | Challenger | Hard | Sebastian Korda | 6–4, 7–6(7–5) |
| Win | 1–0 | M25 Austin, US | WTT | Hard | Eduardo Nava | 6–4, 4–6, 6–4 | |
| Win | 2–0 | M15 Los Angeles, US | WTT | Hard | Brandon Holt | 7–5, 6–4 | |
| Win | 3–0 | M15 Fountain Valley, US | WTT | Hard | Sekou Bangoura | 6–3, 6–1 |
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