The Milwaukee Brewers will be without the services of No. 1 catcher Johnny Estrada for the rest of the season after an MRI exam revealed a medial meniscus tear - also known as torn cartilage - in his left knee. Estrada will have to undergo arthroscopic surgery to repair the cartilage tear but said he wanted to put it off until the Brewers are finished playing so he could be with his teammates. "The doctor said it's a significant tear but otherwise the knee looks good for a 31-year-old catcher," Estrada said. "He said he wouldn't recommend that I keep playing because it could make it worse."