(Note: This article has been updated to include comments from Paddy Caldwell.) Three years ago, American Patrick “Paddy” Caldwell made his debut at Junior World Championships, racing to classic sprint. Then, on Thursday in the men’s 15 k freestyle, he cracked the top 10 for the first time in his U23/Junior Worlds career. “I was really excited going into today’s race,” Caldwell wrote in an email on Friday morning. “15km FS is one of my...