15. Carlos Zambrano vs. Michael Barrett
2007 was a horrible year for the Cubs and tensions were boiling over. After they lost four straight and 10 of 14, nobody was happy. In the fifth inning of a matchup with Atlanta, starter Zambrano gave up five runs on five hits, while catcher Barrett allowed a passed ball and made a throwing error on the same play.
Suddenly, Zambrano decided to confront Barrett. He went over to him in the dugout and shouted in his face. Barrett responded and the next thing was the two of them were scrapping. Finally, teammates forced them apart. However, it was an inglorious moment for both men.