Here's the review for Part One:
Once again Seinfeld finds a way to surprise me. If it isn't having sex with the cleaning lady ("The Red Dot"), it's a contest to see who can go the longest without gratifying themselves ("The Contest"). In this episode we get one of the oddest and best plots in the show's history. Both Jerry and Elaine "fight" over a guy, but not just any guy, former New York Met All-Star and Gold Glover Keith Hernandez. Not only that we get George trying his best to weasel more time out of his unemployment case worker and Kramer and Newman having a problem with Hernandez because they believe he spit on them after a game.
From the opening moments of Jerry and George meeting Hernandez in the locker room to the "JFK" movie parody with Wayne Knight this episode is definitely a series classic.
The second part is just as good. We get an end to the storylines, Jerry says one of the funniest lines in the series history (either Part I or II), and Kramer and Newman settle their score with Hernandez.