The 2026 European Swimming Championships in Paris, France, are set to showcase the men's 400 freestyle, with Germany's Lukas Märtens firmly establishing himself as the favorite. Märtens, the world record holder, has dominated the event in recent years, winning gold at the 2024 Olympics and 2025 World Championships. His season-best of 3:41.76 at the German Nationals, coupled with his ability to take the race out aggressively, makes him a formidable contender. Märtens' focus on the 200 and 400 freestyle, as well as his history of taking the race out aggressively, adds an intriguing layer to his performance. Germany's depth in men's distance swimming is evident, with three swimmers, Oliver Klemet, Johannes Liebmann, and Sven Schwarz, also in contention for a finals berth. Klemet, the second-fastest swimmer this season, and Liebmann, who has shown impressive speed, are expected to challenge Märtens. However, the competition is fierce, with a crowded field of swimmers aiming to secure a spot in the final. James Guy, Leon Marchand, Victor Johansson, Marco de Tullio, and Petar Mitsin are among the contenders, each bringing their own unique strengths and records to the race. The event promises an exciting showdown, with Märtens' dominance and the depth of German swimmers setting the stage for a thrilling competition.