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Marcos Andres Giron ( ghee-ROHN; born July 24, 1993; Spanish: Girón) is an American professional tennis player. He has a career-high singles ranking of world No. 37 achieved on August 5, 2024 and a doubles ranking of No. 194 achieved on August 1, 2022. Giron won the singles title at the 2014 NCAA Division I Tennis Championships for UCLA. He has won an ATP Tour title at the 2024 Hall of Fame Open.
| W | F | SF | QF | | RR | Q# | P# | DNQ | A | Z# | PO | G | S | B | NMS | NTI | P | NH |
| Tournament | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L |
| Grand Slam tournaments | ||||||||||||||
| Australian Open | A | A | A | A | A | A | 1R | 1R | 1R | 1R | 1R | 3R | 0 / 6 | 2–6 |
| French Open | A | A | A | A | A | Q2 | 2R | 3R | 1R | 3R | 1R | 1R | 0 / 6 | 5–6 |
| Wimbledon | A | A | A | A | A | 1R | NH | 2R | 2R | 2R | 2R | 2R | 0 / 6 | 5–6 |
| US Open | 1R | Q1 | A | Q1 | A | 1R | 2R | 2R | 1R | 1R | 1R | 2R | 0 / 8 | 3–8 |
| Win–loss | 0–1 | 0–0 | 0–0 | 0–0 | 0–0 | 0–2 | 2–3 | 4–4 | 1–4 | 3–4 | 1–4 | 4–4 | 0 / 26 | 15–26 |
| National representation | ||||||||||||||
| Summer Olympics | NH | A | NH | 2R | NH | 1R | NH | 0 / 2 | 1–2 | |||||
| ATP 1000 tournaments | ||||||||||||||
| Indian Wells Open | Q1 | A | A | Q1 | Q1 | 3R | NH | 2R | 1R | 2R | 1R | 4R | 0 / 6 | 7–6 |
| Miami Open | A | A | A | A | A | A | NH | 2R | 1R | 1R | 1R | 1R | 0 / 5 | 1–5 |
| Monte-Carlo Masters | A | A | A | A | A | A | NH | A | 1R | A | 1R | 2R | 0 / 3 | 1–3 |
| Madrid Open | A | A | A | A | A | A | NH | 2R | Q1 | 2R | 1R | 2R | 0 / 4 | 3–4 |
| Italian Open | A | A | A | A | A | A | Q1 | Q1 | 3R | 1R | 2R | 3R | 0 / 4 | 5–4 |
| Canadian Open | A | A | A | A | A | A | NH | Q1 | 1R | 3R | 1R | 1R | 0 / 4 | 2–4 |
| Cincinnati Open | Q1 | A | A | A | A | A | 2R | 1R | 2R | Q1 | 1R | 1R | 0 / 5 | 2–5 |
| Shanghai Masters | A | A | A | A | A | A | NH | 2R | 3R | 1R | 0 / 3 | 3–3 | ||
| Paris Masters | A | A | A | A | A | A | 3R | 3R | Q1 | 1R | 2R | 1R | 0 / 5 | 5–5 |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 2–1 | 3–2 | 5–5 | 3–6 | 5–7 | 4–9 | 7–9 | 0 / 39 | 29–39 |
| Career statistics | ||||||||||||||
| Tournaments | 2 | 0 | 0 | 0 | 1 | 4 | 9 | 20 | 28 | 29 | 27 | 27 | 147 | |
| Titles | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | |
| Finals | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 2 | 0 | 3 | |
| Overall win–loss | 0–2 | 0–0 | 0–0 | 0–0 | 1–1 | 2–4 | 9–9 | 23–21 | 18–28 | 24–29 | 27–26 | 23–27 | 127–146 | |
| Year-end ranking | 375 | 469 | 579 | 295 | 308 | 102 | 73 | 66 | 61 | 60 | 46 | 47% | ||
| Legend |
| Grand Slam (0–0) |
| ATP 1000 (0–0) |
| ATP 500 (0–0) |
| ATP 250 (1–2) |
| Finals by surface |
| Hard (0–2) |
| Clay (0–0) |
| Grass (1–0) |
| Finals by setting |
| Outdoor (1–1) |
| Indoor (0–1) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Sep 2022 | San Diego Open, United States | ATP 250 | Hard | Brandon Nakashima | 4–6, 4–6 |
| Loss | 0–2 | Feb 2024 | Dallas Open, United States | ATP 250 | Hard (i) | Tommy Paul | 6–7(3–7), 7–5, 3–6 |
| Win | 1–2 | Jul 2024 | Hall of Fame Open, United States | ATP 250 | Grass | Alex Michelsen | 6–7(4–7), 6–3, 7–5 |
| Legend |
| ATP Challenger Tour (2–1) |
| ITF Futures (6–4) |
| Finals by surface |
| Hard (8–5) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jan 2019 | Orlando Open, US | Challenger | Hard | Darian King | 6–4, 6–4 |
| Loss | 1–1 | Sep 2019 | Oracle Challenger Series – New Haven, US | Challenger | Hard | Tommy Paul | 3–6, 3–6 |
| Win | 2–1 | Nov 2019 | Oracle Challenger Series – Houston, US | Challenger | Hard | Ivo Karlović | 7–5, 6–7(5–7), 7–6(11–9) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Sep 2013 | F23 Claremont, US | Futures | Hard | Dennis Novikov | 6–0, 7–5 |
| Win | 2–0 | Sep 2013 | F25 Laguna Niguel, US | Futures | Hard | Jarmere Jenkins | 4–6, 6–1, 6–1 |
| Win | 3–0 | Mar 2014 | F9 Calabasas, US | Futures | Hard | Jason Jung | 6–4, 4–6, 6–4 |
| Loss | 3–1 | Nov 2014 | F13 Mazatlan, Mexico | Futures | Hard | Daniel Nguyen | 0–6, 6–2, 6–7(0–7) |
| Win | 4–1 | Oct 2016 | F33 Berkeley, US | Futures | Hard | André Göransson | 5–7, 7–6(7–5), 6–4 |
| Win | 5–1 | Jan 2017 | F2 Long Beach, US | Futures | Hard | Collin Altamirano | 7–6(7–3), 6–1 |
| Loss | 5–2 | May 2017 | F7 Wuhan, China | Futures | Hard | Dayne Kelly | 6–7(4–7), 6–7(6–8) |
| Win | 6–2 | May 2017 | F8 Fuzhou, China | Futures | Hard | Alexander Sarkissian | 7–5, 6–4 |
| Loss | 6–3 | Jul 2017 | F4 Saskatoon, Canada | Futures | Hard | Filip Peliwo | 6–7(7–9), 7–6(7–5), 1–6 |
| Loss | 6–4 | Mar 2018 | F8 Calabasas, US | Futures | Hard | JC Aragone | 2–6, 4–6 |
| Legend |
| ATP Challenger Tour (2–0) |
| ITF Futures (3–4) |
| Finals by surface |
| Hard (4–3) |
| Clay (1–1) |
| Grass (0–0) |
| Carpet (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Feb 2019 | RBC Tennis Championships of Dallas, US | Challenger | Hard (i) | Dennis Novikov | Ante Pavić Ruan Roelofse | 6–4, 7–6(7–3) |
| Win | 2–0 | Mar 2019 | Oracle Challenger Series – Indian Wells, US | Challenger | Hard | JC Aragone | Darian King Hunter Reese | 6–4, 6–4 |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Sep 2012 | F26 Irvine, US | Futures | Hard | Dennis Novikov | Devin Britton Austin Krajicek | 2–6 ret. |
| Loss | 0–2 | Jun 2013 | F17 Rochester, US | Futures | Clay | Dennis Novikov | Chase Buchanan Fernando Romboli | 2–6, 3–6 |
| Win | 1–2 | Jul 2013 | F18 Pittsburgh, US | Futures | Clay | Connor Smith | Christopher Mengel Jason Tahir | 6–3, 6–3 |
| Loss | 1–3 | Jul 2013 | F20 Godfrey, US | Futures | Hard | Devin McCarthy | Evan King Peter Kobelt | 5–7, 2–6 |
| Win | 2–3 | Sep 2013 | F24 Costa Mesa, US | Futures | Hard | Mackenzie McDonald | Keith-Patrick Crowley Matt Fawcett | 6–3, 6–2 |
| Loss | 2–4 | Jun 2015 | F3 Richmond, Canada | Futures | Hard | Farris Fathi Gosea | Hunter Nicholas Raymond Sarmiento | 3–6, 4–6 |
| Win | 3–4 | Aug 2015 | F6 Saskatoon, Canada | Futures | Hard | Farris Fathi Gosea | Patrick Davidson Matt Reid | 6–3, 6–2 |
| Season | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | Total |
| Wins | 1 | 0 | 0 | 2 | 1 | 2 | 6 |
| # | Player | Rk | Event | Surface | Rd | Score | Rk | Ref |
| 2020 | ||||||||
| 1. | Matteo Berrettini | 10 | Paris Masters, France | Hard (i) | 2R | 7–6(7–3), 6–7(0–7), 7–5 | 91 | |
| 2023 | ||||||||
| 2. | Holger Rune | 6 | Canadian Open, Canada | Hard | 2R | 6–2, 4–6, 6–3 | 70 | |
| 3. | Casper Ruud | 8 | Japan Open, Japan | Hard | 2R | 6–3, 6–4 | 79 | |
| 2024 | ||||||||
| 4. | Andrey Rublev | 6 | Halle Open, Germany | Grass | 1R | 6–4, 7–6(7–5) | 53 | |
| 2025 | ||||||||
| 5. | Casper Ruud | 5 | Indian Wells Open, United States | Hard | 2R | 7–6(7–4), 3–6, 6–2 | 48 | |
| 6. | Taylor Fritz | 4 | Italian Open, Italy | Clay | 2R | 7–6(7–4), 7–6(7–3) | 45 | |