2016, Gostisbehere scored his 10th goal of the season in the third period of a 2–1 overtime loss to the New Jersey Devils. It was the 11th game in a row that he had registered a point, passing Barry Beck's 1978 record for the longest point streak of any rookie defenseman. On February 20, Gostisbehere became the first rookie in NHL history to score four overtime goals in one season when he helped defeat the Toronto Maple Leafs 5–4. His 15-game point streak ended after that game, as he failed to register a point in the Flyers' 3–1 loss to the Hurricanes. Gostisbehere's point run was the third-longest of any rookie since 1988, and was the longest of any defenseman since Chris Chelios scored points 15 games in a row for the Chicago Blackhawks in 1995. Gostisbehere finished his rookie NHL season with 17 goals and 29 assists, and he became the youngest ever recipient of the Barry Ashbee Trophy, given to the Flyers' best defenseman. The Flyers also awarded Gostisbehere the Gene Hart Memorial Award, given to the player who demonstrates the most "heart". He was also the runner-up for the 2016 Calder Memorial Trophy, awarded annually to the top rookie in the NHL. Artemi Panarin of the Blackhawks ultimately won the award. Following the NHL Awards Show, Gostisbehere was officially named to the NHL All-Rookie Team for the 2015–16 season. 2016–18 Following a disappointing postseason performance at the 2016 Stanley Cup playoffs, the Flyers revealed that Gostisbehere had played through the end of the season with a right hip injury. He underwent surgery for the hip on May 17, 2016, with an expected recovery time of 10–12 weeks. When he returned to the ice for the 2016–17 season, Gostisbehere fell into a sophomore slump, struggling both defensively and offensively. As he fought to play out of the slump, Gostisbehere was a healthy scratch three times, including in back-to-back games. As the season went on, Gostisbehere deleted Twitter from his phone, as the positive fan reaction that he had received during his rookie season had turned negative. He had returned to form by the end of the season, leading the Flyers defense for the second year in a row with 39 points in 76 games. In the final eight games of the season, he averaged one point per game, as well as a +3 plus–minus rating. He attributed his