Cubs starter Carlos Zambrano believes that he has a 'dead arm', which might explain his struggles in the month of August, according to Sporting News. Zambrano has a 7.43 ERA in 26 2/3 innings this month. He recently told the Cubs' official website that he's going through a "dead arm" phase. "I've been doing all my things and my work and have been working out," Zambrano said. "I'm trying to throw as hard as I can, and you see the gun -- 91, 88 [mph]. Everybody goes through these, and I just have to wait for my arm strength and my arm power to come back, so I can do a good job for my team."