Playing career
On March 29, 2023, Ivankovic was drafted in the first round, seventh overall, by the Mississauga Steelheads in the 2023 OHL Priority Selection. He was the first goaltender selected in the draft. On May 2, 2023, he signed with the Steelheads. During the 2023–24 season, in his rookie season, he appeared in 25 games, and posted a 14–5–4 record, with a 2.72 goals against average (GAA) and a .915 save percentage. Following the season he won the F. W. "Dinty" Moore Trophy and was named to the OHL Second All-Rookie team.
During the 2024–25 season, he appeared in 43 games and posted a 25–12–5 record, with a 3.05 GAA and a .903 save percentage during the regular season. He was drafted in the second round, 58th overall, by the Nashville Predators in the 2025 NHL entry draft.
On June 1, 2025, Ivankovic committed to play college ice hockey at Michigan. During the 2025–26 season, in his freshman year, he appeared in 35 games and posted a 25–8–1 record, with a 2.15 GAA and a .921 save percentage. He became the first Michigan goaltender to start 7–0 since Paul Fricker in 1979. During December he led the Big Ten with a 1.02 GAA and .964 save percentage, including a 23-save shutout against No. 3 Michigan State on December 5, 2025. He was subsequently named the Hockey Commissioners Association (HCA) National Goalie of the Month. Following the season he was named to the All-Big Ten Freshman Team and All-Big Ten Second Team. He was also named a semifinalist for the Mike Richter Award.
International play
Ivankovic represented Canada at the 2024 IIHF World U18 Championships and won a gold medal. On December 14, 2024, he was selected to represent Canada at the 2025 World Junior Ice Hockey Championships. During the tournament he appeared in one game against Latvia.
On April 12, 2025, he was again selected to represent Canada at the 2025 IIHF World U18 Championships. During the tournament he posted a 6–0–0 record, with a 1.05 GAA, a .961 save percentage, and won a gold medal. During the gold medal game against Sweden, he stopped all 28 shots, for his second consecutive shutout of the tournament. This marked the first time Canada has won consecutive gold medals at the IIHF World U18 Championship. He was subsequently named to the media all-star team and was named best goaltender by the IIHF Directorate.
In December 2025, he was selected to represent Canada at the 2026 World Junior Ice Hockey Championships. He led the tournament with a 2.34 GAA and won a bronze medal.
Canada
