On September 25, with a 4–3 victory in 10 innings against the New York Yankees, the Marlins secured second place in the NL East, clinching their first playoff berth since 2003.
The Marlins became just the second team in MLB history to reach the postseason the season after losing at least 100 games, joining the 2017 Minnesota Twins.
They subsequently swept the Chicago Cubs in the NLWCS before losing in a three-game sweep to the Atlanta Braves in the NLDS, marking their first postseason series loss in franchise history.
On March 12, 2020, MLB announced that because of the ongoing COVID-19 pandemic, the start of the regular season would be delayed by at least two weeks in addition to the remainder of spring training being cancelled.
[1] Four days later, it was announced that the start of the season would be pushed back indefinitely due to the recommendation made by the CDC to restrict events of more than 50 people for eight weeks.
Source: MLB Standings Grid – 2020 On opening day, July 24, 2020, Marlins catcher Jorge Alfaro was placed on the injured list after testing positive for COVID-19.
[12][13] On July 27, the team's home opener against the Baltimore Orioles was postponed amid reports that eight new players had tested positive for COVID-19.