Louis 3–2 in the 1986 Norris Division Semifinals. (S1) Calgary Flames vs. (S4) Vancouver Canucks This was the fourth playoff series meeting between these two teams. Calgary won two of the previous three meetings, including their most recent meeting 3–1 in the 1984 Smythe Division Semifinals. Calgary defeated Vancouver in seven games. This was the first of three consecutive series between these two teams that ended in overtime of game seven (with the winner of all three series making it to the Stanley Cup Finals). The seventh game went into overtime with both teams having great chances to win the game. The best of these chances was a breakaway for Canucks' captain Stan Smyl who was stopped by Calgary goaltender Mike Vernon. Joel Otto scored the series winner at 19:21 of the first overtime after Jim Peplinski banked it in off Otto's skate to send the Flames into the Smythe Division Final. (S2) Los Angeles Kings vs. (S3) Edmonton Oilers This was the fourth playoff series meeting between the Oilers and Kings, and the first since Wayne Gretzky was traded to the Kings. Edmonton won two of the past three playoff series, including the most recent in the 1987 Smythe Division Semifinals in five games. Division Finals Prince of Wales Conference (A1) Montreal Canadiens vs. (A2) Boston Bruins This was the 24th playoff series between these two teams. Montreal lead 20–3 in all-time playoff meetings. Boston won last year's Adams Division Finals in five games. (P2) Pittsburgh Penguins vs. (P4) Philadelphia Flyers This was the first playoff series between these two teams. In Game 5, Mario Lemieux, listed as questionable before the game due to his neck, tied four NHL playoff records for goals in one period (4), goals in a game (5), points in a game (8) and points in a period (4). Clarence Campbell Conference (N2) St. Louis Blues vs. (N4) Chicago Blackhawks This was the sixth playoff meeting between these two teams, and were meeting for the second straight year. Chicago has won four of the previous five meetings. St. Louis won last year's Norris Division Semifinals in five games. (S1) Calgary Flames vs. (S2) Los Angeles Kings This was the second consecutive and fourth overall playoff meeting between these two teams; with Los Angeles winning two of the three previous series. They met in last year's Smythe Division Semifinals, which Calgary won in five games. Conference