Will participating in 1 round of combat break a short/long rest?

@JeremyECrawford Hope you're having a restful night. Speaking of rest, will participating in 1 round of combat break a short/long rest?

— Derek Gilmore (@dmgpunk) August 11, 2016

Any amount of fighting breaks a short rest. A long rest can withstand an interruption of up to 1 hour. #DnD https://t.co/MPnqN2eDE2

— Jeremy Crawford (@JeremyECrawford) August 12, 2016