TOKYO—Benjamin Savsek won Slovenia’s first gold medal in the men’s canoe slalom on Monday after barreling down the white-water course in Tokyo almost four seconds ahead of his nearest rival. Lukas Rohan from the Czech Republic took silver with Germany’s Sideris Tasiadis, who finished runner-up in 2012, getting bronze. Savsek paddled through the difficult course straight after his German rival in 98.25 seconds, making him the only finalists to complete the course in under 100 seconds. That run brought an end to the dominance of Slovakia and France in the event in which they had won every gold medal since the 1996 Atlanta Games. “It’s a nice step up from world champion to Olympic champion. I am really proud to achieve this,” Savsek said. “The course was pretty hard today,” he added at a news conference wearing the gold medal presented to him by French three-times Olympic slalom champion Tony …