MIAMI -- For the second straight game, the Marlins' biggest home run threat was not in the starting lineup.
Justin Bour continues to get treatment for back spasms, although the Marlins were hopeful before Sunday's 3-0 win over the Rockies that he could possibly be available to participate in some capacity -- if needed -- in the series finale at Marlins Park.
In 25 games, Bour has a slash line of .250/.357/.417 with four home runs and 13 RBIs.
The left-handed-hitting first baseman felt some discomfort while taking batting practice on Saturday night, and he was scratched from the lineup.
"I felt it in the second-to-last round of BP taking some swings," Bour said on Sunday morning. "It got a little bit tight in that back area. So we shut it down, and I've been getting treatment on it."
Bour also dealt with mild back spasms in Spring Training, but the discomfort this time, he says, is in a different area.
The Marlins appear confident Bour's condition isn't too serious.
"He's day to day," manager Don Mattingly said. "He's a little bit sore right now."
The past two seasons, Bour has missed substantial time due to injuries. In 2016, he sustained a high right ankle sprain, and last year he dealt with a strained left oblique.
"This is different," Mattingly said. "He had a high ankle sprain, and those things take a while to heal. Last year, it took a while. This is one we feel like will be day to day. Obviously, you never know. But it seems more in a spot where it is more of a muscle. It's not like it's any kind of tear or sprain, or anything like that."
Worth noting
• Rule 5 Draft pick Elieser Hernandez (tooth infection) continued his rehab assignment on Sunday at Double-A Jacksonville.
• Shortstop JT Riddle (right shoulder tendinitis) is on the move on his rehab assignment. After playing for Double-A Jacksonville on Saturday, going 1-for-4, Riddle is transferring to Triple-A New Orleans. He was given Sunday off before joining the Baby Cakes on Monday.
• Brian Anderson was back at third base on Sunday, with Martin Prado getting a scheduled day off from starting. Anderson has been seeing time in right field. Initially, he was prepared to play in the outfield with his third-base glove, but he is using the glove of Garrett Cooper, who is on the 60-day disabled list with a right wrist injury.
• Catcher J.T. Realmuto started at first base in place of Bour, and John Holaday caught left-hander Caleb Smith.
"At first, when I was doing the lineup and [Realmuto] wasn't in it, it didn't look very good with Martin out today and J.B. out," Mattingly said. "So we thought J.T. being at first base gives us a better look."