Formula 1 superstar Kimi Antonelli was left fearing for his future during an up-and-down rookie campaign that left the paddock wondering if Mercedes had promoted him too early.<br>The 19-year-old was fast-tracked through the single-seater ladder by the German marque, skipping F3 before just one season of F2 as he then replaced Lewis Hamilton for 2025.<br>Those were big shoes to fill for the ...<a class='more' href='https://www.autosport.com/f1/news/antonelli-feared-for-mercedes-f1-future-during-dark-2025-slump/10829051/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-ALL&utm_term=News&utm_content=uk'>Keep reading</a>