The following video shows what can happen to players when they get nervous in tennis matches. Below the video are links to articles to help deal with nerves when playing tennis. Nerves can be a good thing!
Annabel Croft describes how the inability to control her own fear negatively impacted on her ability to play to her potential.
How to beat your nerves by Brad Gilbert
How to Fight a Case of Nerves in Tennis – Five Keys You need to Know by examiner.com
How to Cope with Prematch Anxiety or Nerves by sportspyschologytennis.com
How to Respond Better to Nerves by Mentally Tough Tennis on Facebook
Why getting nervous before competing is a great thing! by McCaw Method on Facebook
Staying Focused/Relaxed during a match by the USTA