How do you almost get concussed playing tennis?
Brazilian star Marcelo Melo found out exactly how the hard way, after getting clocked in the back of the head by a serve from doubles partner Lukas Kubot.
Playing against world number one pairing Henri Kontinen and John Peers at the Rome Masters, the vicious blow required the match to be stopped for an extended period.
Melo was setting up just in front of the net, awaiting the following rally when the wayward serve hit him right in the back of the head.
The blow was bad news for the welfare of Melo, and also spelled disaster for the match, with Kontinen and Peers going on to win 6-4 7-6.
See the incident in the video player above.