The Muon optimizer has demonstrated strong empirical performance in training neural networks with matrix-structured parameters. A central theoretical question is how momentum variance reduction interacts with practical orthogonalization and weight decay. We analyze two variants: the one-batch Muon-MVR1 and the two-batch Muon-MVR2. To the best of our knowledge, this is the first \textbf{horizon-free} convergence analysis of variance-reduced Muon that jointly covers constant mini-batches, finite practical fixed-coefficient Newton--Schulz iterations, and decoupled weight decay in unconstrained stochastic nonconvex optimization. {Muon-MVR1 and Muon-MVR2 attain anytime stationarity rates of $\widetilde{\mathcal{O}}(T^{-1/4})$ and $\widetilde{\mathcal{O}}(T^{-1/3})$, respectively, over $T$ iterations. Under mean-square smoothness, the Muon-MVR2 rate matches the stochastic first-order lower bound up to logarithmic factors. The analysis provides alignment and norm bounds uniform in the step count, together with a nuclear-norm alignment bound that improves with the number of steps.} Under the Polyak--Łojasiewicz (PL) condition and a uniform gradient bound along the iterates, Muon-MVR1 and Muon-MVR2 achieve last-iterate objective-gap rates of $\mathcal{O}(T^{-1/4})$ and $\mathcal{O}(T^{-1/3})$, respectively, with finite NS steps and decoupled weight decay under the prescribed horizon-free schedules. Experiments on CIFAR-10 and C4 support the practical effectiveness of the proposed variance-reduced Muon variants. Code is available at the \href{https://github.com/MaeChd/MUON-MVR}{Muon-MVR repository}.

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