Brad Dalke took the first-round lead Tuesday in the Junior PGA Championship and Samantha Wagner topped the girls' leaderboard.The 15-year-old Dalke, from Hobart, Okla., shot a 6-under 65 at Trump National Golf Club - Washington, D.C., and the 16-year-old Wagner, from Windermere, Fla., opened with a 67.Dalke had six birdies in his bogey-free round."I played really well all day and hit a whole lot of fairways and a lot of greens," Dalke said. "I missed some medium-length putts and could have gone lower, but I'm happy with a 65, for sure."Wagner, coming off her sophomore season in high school, has already committed to the University of Florida."It was nice to birdie my first hole and that gave me a boost heading into the rest of the round," Wagner said. "When I needed to get up and down today I did, and when I had a birdie chance I was able to make it."Sam Stevens of Wichita, Kan., was second in the boys' division at 66. Jacob Solomon of Dublin, Calif.; Cameron Champ of Sacramento, Calif.; and Austin Connelly of Irving, Texas, followed at 68.Kuriko Tsukiyama of West New York, N.J., was second in the girls' division at 69.