Kyrgios underarm serve - fair or not?

[Bilders]

Seeing how far Medvedev is standing back today, it made me think how Nick would bring him in with the occasional underarm serve.

What to my fellow TT users have to say about the tactic, especially if someone is standing practically on the wall?

 

[reaper]

Seeing how far Medvedev is standing back today, it made me think how Nick would bring him in with the occasional underarm serve.

What to my fellow TT users have to say about the tactic, especially if someone is standing practically on the wall?

Perfectly legitimate...

 

[Mark-Touch]

It's unfair and should be permanently banned!