It is important to always keep a positive attitude even when you are losing.  In my short table tennis career, I have seen many players beat themselves as they gave up when losing or beat themselves up after playing a poor point.  Everybody makes mistakes in their strategy and/or technique during matches, even the most elite players in the world.  I have made comments to younger players that were losing to stay positive and heard back “Positive?  This guy is killing me!  I have no chance.”  I often say to myself, “This isn’t over yet.  I can do it.”