Miami(67-67) scored in the top of the first and ended a scoreless streak of 16 innings. Bryan De La Cruz doubled to the left-field wall and Luis Arraez crossed the plate.
It became 3-0 for the Marlins in the third inning. Arraez grounded into a double play and Jesus Sanchez scored.
The Fish upped their lead to a five-run margin in the top of the fifth. Jazz Chisholm, Jr. lifted a three-run homer to right field on a 2-1 pitch with Josh Bell and Jake Burger aboard. Chisholm collected his 14th home run of the season on the play.
Washington(62-73) answered back in the bottom of the fifth and trailed 5-1. C.J. Abrams hit a sacrifice fly to center field and Jake Alu scored.
The Marlins added one more run and led 6-1 in the ninth inning. Burger smacked a solo home run to left-center field for his 28th homer in 2023.