The first results on the standard model Higgs boson decaying to a W-boson pair at \sqrt{s}=13~\mathrm{TeV} at the LHC are reported. The event sample corresponds to an integrated luminosity of 2.3 \pm 0.1~\mathrm{fb}^{-1}, collected by the CMS detector in 2015. The $\mathrm{W}^+\mathrm{W}^-$ candidates are selected in events with an oppositely charged $\mathrm{e}\mu$ pair and large missing transverse momentum in association with up to one jet. The observed (expected) significance for the SM Higgs boson with a mass of 125~\mathrm{GeV} is $0.7\sigma$ ($2.0\sigma$), corresponding to an observed cross section times branching ratio of $0.3 \pm 0.5$ times the standard model prediction.

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