Philadelphia in 1980.
The 76ers lost the 1980 NBA finals to the Lakers 4-2.
The Flyers lost the 1980 Stanley Cup to the Islanders 4-2.
The Phillies defeated the Royals in the 1980 World Series 4-2.
And the trick (and, of course, maybe I am wrong based on how the question is meant to be answered) ... the Eagles played in Super Bowl XV, held in 1981 but is the NFL Championship game for the 1980 season. They lost to the Raiders 27-10.
Three, Liverpool, Chelsea and Manchester United.
The United States played against Ghana, Portugal and Germany in the Group Stage, and Belgium in the Round of 16.
Manchester United beat Barcelona and Bayern Munich.
In the NBA Finals, Game 7 is played at the home court of the team with the better regular-season record. If both teams have the same record, the team that advanced further in the playoffs will host the game. The specific location will depend on which teams make it to the finals and their respective records during the regular season.
2004
There are a total of 8 teams, singles or pairs at the quarter-finals of a tournament.
Barcelona which is about as good as Chivas de Guadalajara & Manchester United.
Canada (7 teams) United States (23 teams)
Considering that their are 8 teams in the quarter finals and their are 4 groups, two teams from each group advance to the quarter finals.
32
The Detroit Pistons in the 2004 Finals and the Boston Celtics in the 2008 Finals.
Yes, there have been instances in the NFL where two wild card teams have met in the conference finals. Notably, in the 2005 season, both the Pittsburgh Steelers and the Seattle Seahawks entered the playoffs as wild card teams and advanced to their respective conference championships. Similarly, in the 2010 season, the Green Bay Packers and the New York Jets, both wild card teams, reached the conference finals.