Biggest one-hit wonders in sports

[SabresRule]

Sometimes, there are teams that have one great season, but don't do much before or after.

Can you recall any examples?

I've got two:

1. 2006 Edmonton Oilers- in the first year after the lockout, they made it all the way to the Stanley Cup Finals #8 seed- they hadn't won a playoff series since 1998 before that, and haven't even made the playoffs since. If they still struggle to make the playoffs or remain unable to make good playoff runs, I will consider this Oilers a one-hit wonder.

2. 2007 Golden State Warriors- They got their 15 minutes of fame by beating Dallas- they don't seem like they're going to get back to that level for a while (They don't have Baron Davis anymore, and I can't see Corey Maggette as their #1 go-to guy/emotional leader).

 

[mccoyrj]

On January 31, 1988, in San Diego, California, Doug Williams of the Washington Redskins becomes the first African-American quarterback to play in a Super Bowl, scoring four of Washington’s five touchdowns in an upset 42-10 victory over the Denver Broncos in Super Bowl XXII. That was about it.​

 

[Fred Derf]

The '85 Bears. 15-1, blew out New England in the Super Bowl 34-10.

 

[The Insider]

The FLA Marlins... Although they did do it twice.. Is their such thing as a two hit wonder?

 

[anders5189]

The '85 Bears. 15-1, blew out New England in the Super Bowl 34-10.

The Bears were no one hit wonder. First they beat NE 46-10, and they were good for several years. The Bears just never got back the SB but they dominated their division for 5-6 years.

 

[Fred Derf]

The Bears were no one hit wonder. First they beat NE 46-10, and they were good for several years. The Bears just never got back the SB but they dominated their division for 5-6 years.

That's right, it was 46, not 34. Sorry, it's been almost 25 years.
I interpreted the thread title (one-hit wonders) to mean only one championship over a *very* long stretch, like the Bears (or the Cubs, for that matter).