Michael Wrona began calling races in Australia at the age of 17. The first track at which he called was Kilcoy, situated about 40 miles from the Queensland capital, Brisbane. and has worked at race tracks in the United States since 1990. His move to the USA was prompted by an invitation from iconic Australian track announcer John Tapp. The management at now-defunct Hollywood Park were interested in signing Tapp as their full-time announcer. However, Tapp did not want to leave Australia but knew that the very talented Wrona would be an ideal person for Hollywood Park. Wrona thought it was a prankster joke when Tapp called him on the phone with the Hollywood Park proposal. The opportunity for a budding young racecaller to join Tapp was the stepping stone to Wrona's now long time of living and working in the United States.
Wrona was hired as the new voice of Santa Anita Park in March 2016. He replaced the iconic Trevor Denman, who was the voice of Santa Anita since 1983. He has previously called races at Golden Gate Fields, and has also worked at Arlington Park, Fair Grounds, Turf Paradise, Lone Star Park, Retama Park, and the old Hollywood Park and Bay Meadows race tracks. He'll work at Del Mar for the first time in 2017.
Michael Wrona has called some historic thoroughbred races during his calling career in the United States.
In 1996, Wrona called the Arlington Citation Challenge at Arlington Park (telecast live, nationwide, on CBS), in which Cigar won his 16th consecutive race. The win tied the previous record of nearly 50 years held by Citation.
On December 10, 1999, at Hollywood Park, Wrona called the race that saw Laffit Pincay Jr pass Bill Shoemaker for most career victories by a jockey. Nearly seven years later, on December 1, 2006, Wrona was the announcer for the race at Bay Meadows in which Russell Baze passed Pincay for the same honors.
On November 11, 2008, as one of five announcers invited to audition for the job at Churchill Downs, Wrona called all seven of Julien Leparoux's winners. Leparoux became only the second jockey in the 134-year history of Churchill Downs to win seven races in a single day. He tied the record set by Pat Day set when he won seven of the eight races on June 20, 1984. Wrona remarked during the race just after crossing the line in the fourth consecutive win on the card by Leparoux: "I tell you, he'd win on a broomstick!". On his fifth day of calling the races, Wrona had to step out due to vocal issues leading to John Asher calling the final two races of the day.
Wrona voiced a race call for the 1992 Seinfeld episode titled "The Subway," in which Kramer overhears a tip while riding a subway train.
Wrona called the 2000 Preakness on a national radio network, filling in for Tom Durkin.
In 2012, Wrona called South America's biggest race, the Gran Premio Carlos Pellegrini, from the Hipodromo de San Isidro in Buenos Aires, Argentina for the HRTV network. This marked the fourth country in which Wrona had broadcast - apart from his two countries of citizenship, Australia and the United States, he was invited to share the announcing duties when thoroughbred racing returned to historic Agua Caliente in Tijuana, Mexico, in 1991.