Samuel Morin, D:The No. 11 pick in the 2013 NHL Draft, Morin, 22, has learned to use his frame (6-foot-6, 202 pounds) in the defensive zone. He had a game-high seven hits against the New Jersey Devils in his NHL debut April 4. … Robert Hagg, D: The 22-year-old had a Flyers-high five shots on goal in his NHL debut April 9. Philadelphia has been impressed by his development in three full seasons with Lehigh Valley in the American Hockey League. … Travis Sanheim, D:The No. 17 pick in the 2014 NHL Draft, Sanheim was sixth among rookie AHL defensemen last season with 37 points (10 goals, 27 assists) and was plus-7 in 76 games for Lehigh Valley. With openings on defense, the 21-year-old will compete with Morin and Hagg for a roster spot. … Oskar Lindblom, LW: A fifth-round pick (No. 138) in 2014, he had 47 points (22 goals, 25 assists) in 52 games for Brynas last season, fourth in the Swedish Hockey League. Lindblom, who turns 21 on Aug. 15, is expected to take a top-nine forward spot this season.