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Michael Mackenzie Lowe McDonald (born April 16, 1995) is an American professional tennis player. He has a career-high singles ranking of world No. 37, achieved on October 16, 2023 and a doubles ranking of No. 49, achieved on October 2, 2023. McDonald won the 2016 NCAA Division I Tennis Championships in both singles and doubles.
| W | F | SF | QF | | RR | Q# | P# | DNQ | A | Z# | PO | G | S | B | NMS | NTI | P | NH |
| Tournament | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% |
| Grand Slam tournaments | ||||||||||||||||
| Australian Open | A | A | A | A | A | 2R | 2R | 1R | 4R | 2R | 3R | 1R | Q3 | 0 / 7 | 8–7 | 53% |
| French Open | A | A | A | A | Q2 | A | 1R | 2R | 2R | 3R | 1R | 1R | 1R | 0 / 7 | 4–7 | 36% |
| Wimbledon | A | A | A | A | Q2 | 4R | A | NH | 1R | 2R | 1R | 1R | 1R | 0 / 6 | 4–6 | 40% |
| US Open | Q1 | Q1 | A | 1R | Q2 | 1R | A | 1R | 2R | 1R | 2R | 1R | 1R | 0 / 8 | 2–8 | 20% |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–1 | 0–0 | 4–3 | 1–2 | 1–3 | 5–4 | 4–4 | 3–4 | 0–4 | 0–3 | 0 / 28 | 18–28 | 39% |
| ATP Masters 1000 | ||||||||||||||||
| Indian Wells Masters | A | A | Q2 | 1R | A | Q2 | 2R | NH | 2R | 2R | 2R | A | 2R | 0 / 6 | 5–6 | 45% |
| Miami Open | A | A | A | A | A | Q2 | 2R | NH | 2R | 3R | 3R | A | 1R | 0 / 5 | 6–5 | 55% |
| Monte-Carlo Masters | A | A | A | A | A | A | A | NH | A | A | 1R | A | A | 0 / 1 | 0–1 | 0% |
| Madrid Open | A | A | A | A | A | A | Q1 | NH | A | Q2 | 1R | A | Q1 | 0 / 1 | 0–1 | 0% |
| Italian Open | A | A | A | A | A | A | A | A | A | Q1 | 1R | 1R | A | 0 / 2 | 0–2 | 0% |
| Canadian Open | A | A | A | A | A | 1R | A | NH | 1R | 1R | QF | 1R | 2R | 0 / 6 | 4–6 | 40% |
| Cincinnati Masters | 1R | Q1 | A | A | Q2 | 1R | A | 1R | 2R | 2R | 3R | Q2 | 1R | 0 / 7 | 4–7 | 36% |
| Shanghai Masters | A | A | A | A | A | 2R | A | NH | 2R | A | 1R | 0 / 3 | 2–3 | 40% | ||
| Paris Masters | A | A | A | A | A | Q1 | A | A | 1R | Q1 | 2R | A | 0 / 2 | 1–2 | 33% | |
| Win–loss | 0–1 | 0–0 | 0–0 | 0–1 | 0–0 | 1–3 | 2–2 | 0–1 | 3–5 | 4–4 | 10–9 | 0–2 | 2–5 | 0 / 33 | 22–33 | 40% |
| Career statistics | ||||||||||||||||
| Tournament | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% |
| Tournaments | 1 | 0 | 0 | 3 | 0 | 13 | 12 | 8 | 19 | 28 | 27 | 13 | 17 | Career total: 141 | ||
| Titles | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Career total: 0 | ||
| Finals | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | Career total: 1 | ||
| Overall win–loss | 0–1 | 0–0 | 0–0 | 0–3 | 0–0 | 9–13 | 10–12 | 4–8 | 18–19 | 26–28 | 33–28 | 5–13 | 10–17 | 0 / 141 | 115–142 | 45% |
| Year-end ranking | 673 | 642 | 371 | 321 | 176 | 78 | 129 | 193 | 55 | 63 | 41 | 131 | ||||
| Tournament | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | SR | W–L | Win% |
| Grand Slam tournaments | ||||||||||||
| Australian Open | A | A | A | 1R | A | 2R | 1R | A | 1R | 0 / 4 | 1–4 | 20% |
| French Open | A | A | A | 1R | 1R | 1R | 3R | 2R | 2R | 0 / 6 | 4–6 | 40% |
| Wimbledon | A | A | Q1 | A | NH | A | 1R | 1R | 2R | 0 / 3 | 1–3 | 25% |
| US Open | 1R | A | 2R | A | QF | 1R | 1R | 3R | 1R | 0 / 7 | 5–7 | 42% |
| Win–loss | 0–1 | 0–0 | 1–1 | 0–2 | 2–2 | 1–3 | 2–4 | 3–3 | 2–4 | 0 / 20 | 11–20 | 35% |
| Result | Year | Tournament | Surface | Partner | Opponents | Score |
| Loss | 2024 | Cincinnati Open | Hard | Alex Michelsen | Marcelo Arévalo Mate Pavić | 2–6, 4–6 |
| Legend |
| Grand Slam (0–0) |
| ATP Masters 1000 (0–0) |
| ATP 500 (0–1) |
| ATP 250 (0–0) |
| Finals by surface |
| Hard (0–1) |
| Clay (0–0) |
| Grass (0–0) |
| Finals by setting |
| Outdoor (0–1) |
| Indoor (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Aug 2021 | Washington Open, United States | ATP 500 | Hard | Jannik Sinner | 5–7, 6–4, 5–7 |
| Legend |
| Grand Slam (0–0) |
| ATP Masters 1000 (0–1) |
| ATP 500 (1–1) |
| ATP 250 (0–0) |
| Finals by surface |
| Hard (1–2) |
| Clay (0–0) |
| Grass (0–0) |
| Finals by setting |
| Outdoor (1–2) |
| Indoor (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Oct 2022 | Japan Open, Japan | ATP 500 | Hard | Marcelo Melo | Rafael Matos David Vega Hernández | 6–4, 3–6, [10–4] |
| Loss | 1–1 | Jul 2023 | Washington Open, United States | ATP 500 | Hard | Ben Shelton | Máximo González Andrés Molteni | 7–6(7–4), 2–6, [6–10] |
| Loss | 1–2 | Aug 2024 | Cincinnati Open, United States | ATP 1000 | Hard | Alex Michelsen | Marcelo Arévalo Mate Pavić | 2–6, 4–6 |
| Legend |
| ATP Challenger Tour (4–6) |
| ITF Futures (2–1) |
| Finals by surface |
| Hard (6–7) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Oct 2017 | Fairfield Challenger, US | Challenger | Hard | Bradley Klahn | 6–4, 6–2 |
| Loss | 1–1 | Jan 2018 | RBC Tennis Championships of Dallas, US | Challenger | Hard (i) | Kei Nishikori | 1–6, 4–6 |
| Win | 2–1 | Apr 2018 | Seoul Open Challenger, South Korea | Challenger | Hard | Jordan Thompson | 1–6, 6–4, 6–1 |
| Loss | 2–2 | Feb 2019 | RBC Tennis Championships of Dallas, US | Challenger | Hard (i) | Mitchell Krueger | 6–4, 6–7(3–7), 1–6 |
| Win | 3–2 | Feb 2021 | Nur-Sultan Challenger, Kazakhstan | Challenger | Hard (i) | Jurij Rodionov | 6–1, 6–2 |
| Loss | 3–3 | Sep 2024 | Nonthaburi Challenger, Thailand | Challenger | Hard | Wu Tung-lin | 3–6, 6–7(4–7) |
| Loss | 3–4 | Oct 2024 | Hangzhou Challenger, China | Challenger | Hard | James Duckworth | 6–2, 6–7(5–7), 4–6 |
| Win | 4–4 | Oct 2024 | Shenzhen Longhua Open, China | Challenger | Hard | Arthur Cazaux | 6–4, 7–6(7–4) |
| Loss | 4–5 | Feb 2025 | San Diego Open, US | Challenger | Hard | Eliot Spizzirri | 4–6, 6–2, 4–6 |
| Loss | 4–6 | Oct 2025 | Jinan Open, China | Challenger | Hard | Arthur Cazaux | 3–6, 2–6 |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Sep 2015 | F26 Claremont, US | Futures | Hard | Deiton Baughman | 6–2, 3–6, 3–6 |
| Win | 1–1 | Sep 2016 | F29 Irvine, US | Futures | Hard | Jan Choinski | 6–0, 6–3 |
| Win | 2–1 | Jan 2017 | F1 Los Angeles, US | Futures | Hard | Carl Söderlund | 6–4, 6–0 |
| Legend |
| ATP Challenger Tour (2–1) |
| ITF Futures (5–1) |
| Finals by surface |
| Hard (7–2) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Aug 2016 | Nordic Naturals Challenger, US | Challenger | Hard | Ben McLachlan | Nicolaas Scholtz Tucker Vorster | 7–6(7–5), 3–6, [8–10] |
| Win | 1–1 | Oct 2016 | Fairfield Challenger, US | Challenger | Hard | Brian Baker | Sekou Bangoura Eric Quigley | 6–3, 6–4 |
| Win | 2–1 | Jan 2018 | City of Playford Tennis International, Australia | Challenger | Hard | Tommy Paul | Maverick Banes Jason Kubler | 7–6(7–4), 6–4 |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Sep 2013 | F24 Costa Mesa, US | Futures | Hard | Marcos Giron | Keith-Patrick Crowley Matt Fawcett | 6–3, 6–2 |
| Win | 2–0 | Jun 2014 | F17 Oklahoma City, US | Futures | Hard | Martin Redlicki | Jesús Bandrés Gonzalo Escobar | 4–6, 7–6(7–3), [10–8] |
| Loss | 2–1 | Sep 2014 | F25 Costa Mesa, US | Futures | Hard | Martin Redlicki | Nicholas Hunter Junior Alexander Ore | 6–4, 4–6, [8–10] |
| Win | 3–1 | Sep 2015 | F27 Costa Mesa, US | Futures | Hard | Martin Redlicki | Jean-Yves Aubone Benjamin Lock | 6–2, 3–6, [10–5] |
| Win | 4–1 | Sep 2016 | F29 Irvine, US | Futures | Hard | Deiton Baughman | Timothy Sah Ryan Seggerman | 6–4, 6–3 |
| Win | 5–1 | Apr 2017 | F12 Memphis, US | Futures | Hard | Lloyd Glasspool | Philip Bester Alex Lawson | 6–2, 7–6(7–3) |
| Season | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | Total |
| Wins | 1 | 0 | 0 | 0 | 4 | 0 | 0 | 5 |
| # | Player | Rank | Event | Surface | Rd | Score | MMR | Ref |
| 2019 | ||||||||
| 1. | Juan Martín del Potro | 4 | Delray Beach Open, United States | Hard | QF | 6–4, 3–6, 7–6(7–5) | 84 | |
| 2023 | ||||||||
| 2. | Rafael Nadal | 2 | Australian Open, Australia | Hard | 2R | 6–4, 6–4, 7–5 | 65 | |
| 3. | Taylor Fritz | 9 | Eastbourne International, United Kingdom | Grass | 2R | 7–6(7–3), 7–6(10–8) | 64 | |
| 4. | Andrey Rublev | 7 | Canadian Open, Canada | Hard | 2R | 6–4, 6–3 | 59 | |
| 5. | Holger Rune | 5 | Cincinnati Masters, United States | Hard | 2R | 6–4, 2–0 ret. | 43 | |
| Awards | ||
| Preceded by Vasek Pospisil | ATP Comeback Player of the Year 2021 | Succeeded by Borna Ćorić |