Career
McDonald was a semifinalist in boys" singles of the 2012 Australian Open. McDonald also qualified for the 2013 Western & Southern Open as a freshman at University of California, Los Los Angeles McDonald lost in the first round to David Goffin in straight sets. He was subsequently given a wildcard entry into the 2013 United States Open qualifying.
McDonald qualified into the main draw of the 2014 Challenger in Winnetka, Illinois and defeated world northern
154 Sam Groth. At the 2015 National Collegiate Athletic Association Division I Men"s Tennis Championship, he defeated top-ranked Axel Alvarez of Oklahoma during team competition.