Michael Mackenzie Lowe "Mackie" McDonald (born April 16, 1995) is an American professional tennis player. He reached a career-high singles ranking of world No. 48 on 1 August 2022, and No. 90 in doubles on 17 October 2022. He won the 2016 NCAA Division I Tennis Championships in both singles and doubles. Juniors career McDonald was a semifinalist in the boys' singles of the 2012 Australian Open. In 2012, he reached a career high ranking in the ITF World Tour Junior Rankings of number 12 and won the 18s singles title at the 2012 Easter Bowl. While still a junior, he won the men's singles in the Ojai Tennis Tournament in 2013 and also qualified for the 2013 Cincinnati Masters at age 18 by defeating top 100 players Nicolas Mahut and Steve Johnson. However, he lost in the first round of the main draw to fellow qualifier David Goffin. College career 2014 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...