Carlos Sainz is in talks with Mercedes over a 2025 contract but one issue has arisen, according to a report. Sainz is without a drive for next year after Ferrari signed Lewis Hamilton from the Silver Arrows. After Aston Martin successfully tied down Fernando Alonso, Mercedes may be the last front-running team with a vacancy. Lance Stroll is out of contract but his father Lawrence owns the team. According to FUnoAnalisiTecnica, Sainz is indeed in talks with Toto Wolff’s team. But negotiations aren’t proving to be straightforward. READ MORE: Ferrari driver Carlos Sainz’s life outside F1 from ful…