[6] In December, 1984 he became the Central American Bureau Chief for what was then called the Spanish International Network (today known as Univision).

He subsequently established himself as a television news reporter in Miami, where he worked for WTVJ from 1988 till he was hired by CBS in May 1996.

[2] By 2000, he returned to Spanish language network television; he became the anchor of a new Telemundo morning program called Esta Mañana.

He again made history when he substituted for Contessa Brewer on MSNBC Live for the week of June 20 through 24, 2011, in the show's 12 PM time slot, making him the first U.S. journalist to broadcast both English and Spanish newscasts on two networks simultaneously.

[14] In late 2015, he also began working as a fill-in anchor for the Saturday edition of NBC Nightly News.

[15] On February 18, 2016, Diaz-Balart moderated the Democratic Town Hall with Hillary Clinton and Bernie Sanders, in Las Vegas, Nevada.

[18] Diaz-Balart is the recipient of five national Emmys for his work with Telemundo Network, including 2020-2021 Outstanding Newscast Anchor.

[19] In 2022 Diaz-Balart received the TV Broadcast Journalist Award by the MultiCultural Media Correspondents Association in Washington DC.