Watch: Shawn Mendes and John Mayer perform together live.

April 4, 2017 | by Shahlin Graves

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".

The dynamite @shawnmendes joined me in Toronto tonight perform a "Mercy"/"In Your Atmosphere" mashup and it was over the top good. #thesearchforeverything #shawnmendes #bringingbacktheworddynamite

A post shared by johnmayer (@johnmayer) on Apr 3, 2017 at 10:56pm PDT

John Mayer talking about Shawn during his livestream on Instagram today. pic.twitter.com/LhcTWHKX7G

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

Damn. John Mayer is the best. My job is the best. U guys are the best. What an insane night.

— Shawn Mendes (@ShawnMendes) April 4, 2017

Watch clips of the performance below...

Shawn Mendes and John Mayer performing their mashup of Mercy and In Your Atmosphere in the Air Canada Centre in Toronto, Canada. pic.twitter.com/Iex7vGheBf

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

Shawn Mendes performing onstage with John Mayer in the Air Canada Centre in Toronto, Canada. pic.twitter.com/OQD2Fd0G3E

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

Shawn Mendes singing "Mercy" onstage at inthe Air Canada Centre with John Mayer in Toronto, Canada. pic.twitter.com/XtSHC6B44O

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

Shawn performing onstage with John Mayer in the Air Canada Centre in Toronto last night. pic.twitter.com/RHsuIQ5BG7

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

Shawn Mendes performing "Mercy" with John Mayer last night via Andrew Gertler's Instagram story. pic.twitter.com/WXTYhEkLBs

— Shawn Mendes News (@ShawnMendesNews) April 4, 2017

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Watch: Shawn Mendes and John Mayer perform together live.

Watch: Shawn Mendes and John Mayer perform together live.

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Watch: Shawn Mendes and John Mayer perform together live.

Watch: Shawn Mendes and John Mayer perform together live.

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