Name the longest baseball game ever played.

[cherokeeprogressive]

Name the two teams who played it.

Also, name the longest inning ever played.

[Gemini Cat]

1. I'm not sure.

Possibly the game between the NYY and KCRoyals back sometime in the 1980's. The game was called in the 9th (?) for the day because of a fight and resumed a few weeks later, hence the longest game and inning.
I don't think that was the answer you wanted for your question however.

[cherokeeprogressive]

2. Ding Ding... You Win.

It was actually called "The Pine Tar Game". The game, and the top of the ninth inning, took 25 days to play. I saw the game, and it was ho-hum until the top of the ninth. Interesting baseball history...

"The bat is currently on display in the Baseball Hall of Fame, where it has been since 1987. During a broadcast of Mike & Mike in the Morning, ESPN analyst Tim Kurkjian stated that Brett used the bat for a few games after the incident until being cautioned that the bat would be useless if broken. Brett sold the bat to famed collector and then partial owner of the Yankees, Barry Halper, for $25,000<[1>], had second thoughts, repurchased the bat for the same amount from the collector and then donated the bat to the Hall of Fame. The home run ball was caught and sold by journalist Ephraim Schwartz to Halper for $500 plus 12 Yankees tickets<2>, as well as Schwartz' ticket stub<[2>]. Halper also aquired the signed business card of Orest V. Maresca, the magistrate who made the initial ruling in the ensuing controversy, and the can of Oriole Pine Tar from which Brett used on the bat. Gossage later signed the pine tar ball "Barry, I threw the fucking thing." <[3>]"

http://en.wikipedia.org/wiki/Pine_Tar_Incident