I already covered the Miami Marlins Fangraphs rankings for first base and also for second base. The Fangraphs ratings are for the position including starter and the depth behind him. For third base Fangraphs looked at the starter Jean Segura, SS Joey Wendle, 3B Luis Arraez, bench player Jon Berti and Jordan Groshans as Minor League depth. I don't really think that either Wendle or Arraez will play the position at all in 2023, but I guess that Fangraphs does for some reason.
The Miami Marlins are ranked #14 in the Fangraphs 3B rankings.
Jean Segura is projected to bat .273/.330/.390 in 2023 as the Miami Marlins starting third baseman. He batted .277/.336/.387 for the Philadelphia Phillies in 2022. There's some concern that he will have issyes moving to third base for the first time in his career, but I think that the former SS will ultimately be fine there. I think that Segura should hit well enough for contact to be a solid part of the lineup, and that he'll be closer to his 2022 numbers than the ones that Fangraphs projects.
Joey Wendle is projected for a .264/.312/.390 batting line in 2023. I just don't understand why he would have to play third base, when there's enough depth to fill-in for Segura and when Wendle is already the Miami Marlins starting SS. Jon Berti is a pretty good substitute off of the bench, considering that he led the Major Leagues in stolen bases in 2022. He is projected to bat .235/.321/.341 in 2023. I think that he will play all over the field, so I can definitely see him filling in at third base at some point.
Jordan Groshans is Minor League depth at this point, which is sad as he looked like a starter of the future in 2022. I'm not so sure about that now. He is expected to bat .254/.324/.345 in 2023, which is pretty underwhelming to be honest. I don't know why Fangraphs expects Luis Arraez to play third base, when he's more likely to fill in at first base then at third base in my opinion. He's projected for a .304/.366/.407 batting line in 2023.