Isner reveals the most unlikely doping test he's ever experienced: "I was followed into an airport toilet"

In the latest episode of the Nothing Major podcast, John Isner, Sam Querrey, Jack Sock and Steve Johnson all shared anecdotes of doping tests they've experienced in their careers.

Isner revealed that he had been tested at an airport, as players can be tested anywhere and at any time during the season: "I went to the airport with a test person because I had to catch a plane.

I say to myself, 'Dude, I've got an eight o'clock flight (in the morning), I've just been to the toilet'. He followed me into the Tampa airport.

I told him that once I finished check-in, I should probably go to the bathroom. I told him we'd work it that way, and he said, "Okay.

I checked in my luggage, had to get him through the security check and then told him I could go pee. He followed me into the airport toilets. That happened once.

If you don't give him that sample, it counts as a missed test."