"I think we really settled on that the last few days," Mattingly said.
2016 season: Tickets | Schedule | Gear
Wei-Yin Chen will get the starting nod on Tuesday against former American League Cy Young Award winner Justin Verlander.
Mattingly on Monday announced Miami's batting order as follows:
1. Dee Gordon, 2B
2. Marcell Ozuna, CF
3. Christian Yelich, LF
4. Giancarlo Stanton, RF
5. Martin Prado, 3B
6. Justin Bour, 1B
7. J.T. Realmuto, C
8. Adeiny Hechavarria, SS
9. Wei-Yin Chen, P
The Marlins' lineup features left-handed hitters in Gordon, Yelich and Bour.
"We wanted to separate Christian and J.B," Mattingly said. "That way, with the two righties in the middle, we're at a spot where it forces them if they are going to bring in a lefty for Christian."
If Bour were fifth, teams could bring in a lefty for Yelich, then pitch around Stanton with the same pitcher, to face Bour. Now, Stanton and Prado are a pair of proven right-handed hitters in the middle.
Bour offers more power than Prado, but he doesn't have much history against left-handed pitchers -- just 75 plate appearances in 2015, and a .221 batting average. All 23 of his home runs in 2015 were against right-handed pitchers, and so were 64 of his 73 RBIs.
Prado had nine homers and 63 RBIs last year. With runners on base, his slash line was .318/.369/.436.
"We just wanted to force a little different play on their hand," Mattingly said.