That's just cold! Chung makes the perfect volley and Federer still makes him pay. Brilliant stuff from Federer, who now leads Hyeon Chung 4-3 (on serve) in set one.

Naughty, very naughty @rogerfederer!

The Swiss is off to a flyer in his #BNPPO18 QF pic.twitter.com/cIIXHH5FnX

— Tennis TV (@TennisTV) March 16, 2018