Using the multi-criteria decision making (MCDM) method, this study analyzed the strength and weakness of professional baseball teams in the Chinese Professional Baseball League (CPBL) of Taiwan. With the complexity of evaluation and the characteristics of MCDM in mind, analysis hierarchy process (AHP) was used to obtain the weight of evaluation criteria for pitchers and fielders of each team. Then, Grey relational analysis was applied to assess the ranking of these players, by adopting the actual data from the 2011 CPBL season. Results showed the significant differences in weight of the evaluation criteria for the pitchers and fielders, due to differences in their roles. Their ranking in CPBL showed that the overall performance of Sinon Bulls was relatively weaker than the other teams, as Uni-President 7-Eleven Lions, Lamigo Monkeys and Brother Elephants have their own unique strengths. In conclusion, this study demonstrated the application of AHP and Grey relational analyses to evaluate the strength of professional baseball teams more objectively, which can help to construct the appropriate strategies to strengthen their performance.