Even the best athletes lose. Once you can enjoy what you do...and not be focused so much on the outcome that has or has not happened....your overall performance will probably increase and you will do better and perhaps win more in the process. Focus only on what you need to do in the present moment where the ego can not exist...as it is too caught up in the past and future.
After every match...smile...go shake your opponents hand...tell him nice job...and know you gave it your best. Then just move on.....