Often in a pressure match, a coach will tell you to find your "Happy Place" in your mind where you can relax and find harmony. The "Happy Place" I want to talk about is physical.
When you are playing a match, the court position that you tend to be in most often during the point can be considered your "Happy Place." For example, some players' "Happy Place" will be the area around the baseline. If your opponent allows you to play and win from your "Happy Place" then you are lucky. However, if you are losing a match from your "Happy Place" you must be able to make a change.
You might pull your opponent from his or her "Happy Place" or force yourself forward out of your "Happy Place" to attack the net. If you are losing from the baseline try serve and volley, chip and charge and following your lobs to the net. Do not allow your opponent to win a match from his or her "Happy Place."
Make a change. Your ultimate goal is to feel comfortable in all parts of the court, making the entire court your "Happy Place." If your opponent's "Happy Place" is the baseline, try hitting short under-spin shots to pull him/her in. If your opponents "Happy Place" is the net, throw up lobs to push them back, make it your goal to get them out of their "Happy Place."
Pay attention to your "Happy Place" and that of your opponent.
Good luck on the court!