The 1972–73 NHL season was the 56th season of the National Hockey League. Sixteen teams each played 78 games. Two new teams, the New York Islanders and the Atlanta Flames, made their debuts. The Montreal Canadiens won the Stanley Cup by beating the Chicago Black Hawks four games to two in the Stanley Cup Final. Taken from https://en.wikipedia.org/wiki/1972%E2%80%9373_NHL_season

The 1972–73 WHA season was the first season of the World Hockey Association (WHA). Twelve teams played 78 games each. The league was officially incorporated in June of 1971 by Garry L. Davidson and Dennis A. Murphy and promised to ice twelve teams in various markets around Canada and the United States. The league championship trophy, the Avco World Trophy, was donated by AVCO Financial Services Corporation along with $500,000. The New England Whalers won the first Avco World Trophy. Taken from https://en.wikipedia.org/wiki/1972%E2%80%9373_WHA_season

Final Stats:

NHL
League Standings
Team	GP	W	L	T	PTS
East Division
Montreal Canadiens*	78	52	10	16	120
Boston Bruins*	78	51	22	5	107
New York Rangers*	78	47	23	8	102
Buffalo Sabres*	78	37	27	14	88
Detroit Red Wings	78	37	29	12	86
Toronto Maple Leafs	78	27	41	10	64
Vancouver Canucks	78	22	47	9	53
New York Islanders	78	12	60	6	30
West Division
Chicago Black Hawks*	78	42	27	9	93
Minnesota North Stars*	78	37	30	11	85
Philadelphia Flyers*	78	37	30	11	85
St. Louis Blues*	78	32	34	12	76
Pittsburgh Penguins	78	32	37	9	73
Los Angeles Kings	78	31	36	11	73
Atlanta Flames	78	25	38	15	65
California Golden Seals	78	16	46	16	48
League Playoff Series
Stanley Cup Final	4 2	Montreal Canadiens over Chicago Black Hawks
Semi-Finals	4 1	Chicago Black Hawks over New York Rangers
Semi-Finals	4 1	Montreal Canadiens over Philadelphia Flyers
Quarter-Finals	4 2	Philadelphia Flyers over Minnesota North Stars
Quarter-Finals	4 1	Chicago Black Hawks over St. Louis Blues
Quarter-Finals	4 1	New York Rangers over Boston Bruins
Quarter-Finals	4 2	Montreal Canadiens over Buffalo Sabres
Most goals per game: 4.2
Boston Bruins
Fewest goals allowed per game: 2.4
Montreal Canadiens
Most goals scored in a game: 11
11/25/1972	California Golden Seals	0	Toronto Maple Leafs	11
1/3/1973	Vancouver Canucks	3	California Golden Seals	11
3/24/1973	St. Louis Blues	4	Montreal Canadiens	11
WHA
League Standings
Team	GP	W	L	T	PTS
East Division
New England Whalers*	78	46	30	2	94
Cleveland Crusaders*	78	43	32	3	89
Philadelphia Blazers*	78	38	40	0	76
Ottawa Nationals*	78	35	39	4	74
Quebec Nordiques	78	33	40	5	71
New York Raiders	78	33	43	2	68
West Division
Winnipeg Jets*	78	43	31	4	90
Houston Aeros*	78	39	35	4	82
Los Angeles Sharks*	78	37	35	6	80
Minnesota Fighting Saints*	78	38	37	3	79
Alberta Oilers	78	38	37	3	79
Chicago Cougars	78	26	50	2	54
League Playoff Series
Avco Cup Final	4 1	New England Whalers over Winnipeg Jets
Division Finals	4 0	Winnipeg Jets over Houston Aeros
Division Finals	4 1	New England Whalers over Cleveland Crusaders
Division Semi-Finals	4 1	Winnipeg Jets over Minnesota Fighting Saints
Division Semi-Finals	4 2	Houston Aeros over Los Angeles Sharks
Division Semi-Finals	4 1	New England Whalers over Ottawa Nationals
Division Semi-Finals	4 0	Cleveland Crusaders over Philadelphia Blazers
Preliminary Round	1 0	Minnesota Fighting Saints over Alberta Oilers
Most goals per game: 4.1
New England Whalers
Fewest goals allowed per game: 3.1
Cleveland Crusaders
Most goals scored in a game: 11
1/23/1973	Ottawa Nationals	3	Houston Aeros	11
1/30/1973	New York Raiders	3	Alberta Oilers	11
3/9/1973	Quebec Nordiques	3	Philadelphia Blazers	11
3/11/1973	Cleveland Crusaders	11	Winnipeg Jets	2