Watch: Shawn Mendes and John Mayer perform together live.

Watch: Shawn Mendes and John Mayer perform together live.

Shawn Mendes joined John Mayer on-stage during his show in Toronto last night to perform a mash-up of (Mendes’) 'Mercy' and (Mayer’s) 'In Your Atmosphere', which Mayer has described as "over the top good".

Watch clips of the performance below...

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