WASHINGTON -

Giancarlo Stanton and Christian Yelich homered to lift the Miami Marlins over the Washington Nationals 4-2 in the opener of Sunday's day-night doubleheader, a result that clinched playoff berths for the Atlanta Braves and St. Louis Cardinals.

Washington can win no more than 90 games, ensuring Atlanta (91-63) its first NL East title since 2005. St. Louis (91-64), which leads the NL Central, is assured no worse than a wild-card berth.

The Nationals began the day 4 1/2 games behind Cincinnati for the final NL wild card and have just seven games remaining