Mackenzie McDonald

McDonald was listed as the No. 1 player coming into college according to the ITA. As a freshman at UCLA, he was named a Singles All-American and the Pac-12 Freshman of the Year. McDonald was also a quarterfinalist at the NCAA singles championship while compiling a 33–9 record during the season, including an 18–4 record in dual matches.

At the 2015 NCAA Division I Men's Tennis Championship, he defeated top-ranked Axel Alvarez of Oklahoma during team competition. He played #1 singles and doubles for the UCLA Bruins for most of the season.

During the 2016 season, he helped his Bruins to the quarterfinals of the Division I Tennis Team Championship. Then on Memorial Day, May 30, McDonald defeated the No. 1 ranked Mikael Torpegaard of Ohio State University for the singles championship at the Michael D. Case Tennis Center, in Tulsa, Oklahoma. He became the 12th UCLA Bruins player to win the singles title. McDonald also teamed with Martin Redlicki to play for the doubles championship. They defeated the team of Arthur Rinderknech and Jackson Withrow from Texas A&M to win the doubles individual championship. In doing so, McDonald became the first college player to win both the national singles and doubles titles since Matías Boeker of the University of Georgia in 2001. After the NCAA tournament, on June 16, 2016, he announced that he would not return to UCLA for his senior year, but turn professional.[6]

At age 18, McDonald qualified for the 2013 Western & Southern Open[3] by defeating two top 100 players despite never previously having earned an ATP point. He became first unranked teenager to qualify for an ATP World Tour Masters 1000 tournament since Sergio Casal at the 1995 Miami Masters. McDonald lost in the first round to David Goffin in straight sets.[7] He was subsequently given a wildcard entry into the 2013 US Open qualifying.

McDonald qualified into the main draw of the 2014 Challenger in Winnetka, Illinois and defeated world no. 154 Sam Groth.

McDonald at the 2016 US Open

McDonald was awarded a wild card into the main draw of the US Open, where he lost to Czech qualifier Jan Šátral in five sets in the first round.[8] Beginning in late September and lasting through early October, McDonald had an impressive string of results in Challenger-level tournaments, winning his first ITF Pro Circuit title at USA F29 Irvine Futures, as well as reaching back-to-back semifinals in Tiburon and Stockton with impressive wins over three top-150 players.

McDonald began the season winning the singles title at the F1 Los Angeles Pro Futures held at the University of Southern California, beating Carl Söderlund in the final 6–4, 6–0 by winning the last eleven games.[9] In March at the BNP Paribas Open at Indian Wells, McDonald, along with former University of Virginia tennis player Danielle Collins, were selected to receive the Oracle US Tennis Awards, given to exceptional collegiate players transitioning to a professional.[10] McDonald won the USA F12 Futures doubles event with Lloyd Glasspool, his fifth career Futures doubles title.

He participated in his first Australian Open in January where he defeated Elias Ymer 6–4, 6–3, 3–6, 6–1 in the first round after winning the qualifiers. In the next round, he was defeated by 3rd ranked Grigor Dimitrov in a 5 set thriller, losing 6–4, 2–6, 4–6, 6–0, 6–8.[11] Later, he won the Seoul Challenger 1–6, 6–4, 6–1 against Jordan Thompson.[12]

At Wimbledon, he reached his first Grand Slam third-round by winning his first-ever 5-set match, 11–9 in the 5th, over Nicolás Jarry in the round of 64.[13] He then proceeded to defeat Guido Pella in straight sets to reach the second week of a grand slam for the first time in his career.[14][15] He was then defeated in four sets by Milos Raonic in the round of 16.[16]

McDonald reached the final of the 2019 Dallas Challenger in February, where he lost 6–4, 6–7⁽³⁾, 1–6 to Mitchell Krueger, despite leading by a set and a break in the 2nd set. He also participated in the 2019 Delray Beach Open in February, where he achieved his first top 10 win by defeating Juan Martín del Potro in the quarterfinals 6–4, 3–6, 7–6⁽⁵⁾ to reach his first ATP level semifinal,[17] where he lost to Radu Albot 6–3, 0–6, 0–6.[18] His good form carried on into the ATP 500 Acapulco tournament, where he reached the quarterfinals, eventually losing to Cameron Norrie 3–6, 2–6. These results helped propel him to a then career-high ranking of World No. 62 on 4 March 2019.

At the 2019 French Open, McDonald suffered a serious hamstring injury in his first round doubles match, forcing him to miss the rest of the 2019 season.[19]

McDonald returned to the tour at the 2020 Auckland Open, where he lost in qualifiers to Mikael Ymer. He then used a protected ranking to enter the 2020 Australian Open, where he lost in the first round to 30th seed Dan Evans, despite having a 2 sets to love lead.[20]

At the 2020 US Open, McDonald lost to 30th seed Casper Ruud from 2 sets up.[21]

At the 2020 French Open, on his debut at this Major, McDonald earned his first victory at a Major since the 2019 Australian Open. Under the supervision of his new coach Jaime Pulgar García, he defeated Canadian qualifier Steven Diez in 4 sets before losing to defending (and eventual) champion Rafael Nadal in the second round in straight sets.[22]

At the 2021 Australian Open, McDonald reached the 4th round of a Major for the second time, defeating Marco Cecchinato, 22nd seed Borna Ćorić, and Lloyd Harris. He was defeated in the 4th round by 4th seed and eventual finalist Daniil Medvedev in straight sets.[23]

McDonald reached the semifinals at ATP 500 level for the first time at the 2021 Citi Open, defeating defending champion Nick Kyrgios,[24] 13th seed Benoît Paire, Ilya Ivashka, and Denis Kudla. There, he defeated 2015 champion Kei Nishikori in three sets to reach his first ATP final.[25] McDonald lost to 5th seed Jannik Sinner in three sets in the final.[26] As a result, he returned to the top 100 for the first time in 2 years, climbing more than 40 positions up in the rankings to world No. 64 on 9 August 2021.

Current through the 2021 Stockholm Open.

McDonald's match record against those who have been ranked in the top 10, with those who have been No. 1 in boldface

*As of 28 October 2021.

McDonald has a 1–7 (12.5%) record against players who were, at the time the match was played, ranked in the top 10.

#	Player	Rank	Event	Surface	Rd	Score	MMR
2019
1.	Juan Martín del Potro	4	Delray Beach, United States	Hard	QF	6–4, 3–6, 7–6(7–5)	84