We present in this paper a new performance analysis results of dual-branch maximal-ratio combining over correlated Nakagami-m fading channels with arbitrary fading parameter. In particular, we derive exact closed-form expressions of the outage probability, the average bit error rate, and the ergodic capacity in terms of the extended generalized bivariate Meijer G-function. Moreover, we also provide simple closed-form asymptotic expressions in the high signal-to-noise ratio regime of these three fundamental performance measures.Index Terms-Outage probability, Average bit error probability, Ergodic capacity, correlated branches, Nakagami-m fading, diversity, Correlated Gamma variates, Maximal-ratio combining (MRC), Asymptotic, High SNR.