WATCH: John Mayer & Shawn Mendes Perform Mash-Up

John Mayer and Shawn Mendes have blessed us with a "Mercy" and "In Your Atmosphere" mash-up.

Mendes made a surprise guest appearance on Mayer’s The Search for Everything World Tour stop at Toronto’s Air Canada Centre April 3.

The 18-year-old has looked up to Mayer since the beginning of his career and we can only imagine how great of a moment this was for him.

What do you think of this pairing?

Watch below!