Wimbledon line-call failure came after operator turned cameras off by mistake

System was unintentionally deactivated with one computer click, it is understood, sparking chaos on Centre Court

Wimbledon's electronic line-calling failure on Sunday came after an operator unintentionally switched off a set of cameras on Centre Court with one computer click, it is understood.

Bosses earlier defended the new system as they continued to blame Sunday's seven minutes of chaos on human error.