In order to recover from a mental block on your forehand you need to first understand that losing a stroke is natural, so do not panic. Tennis players go through ups and downs in every stroke and you need to embrace that. Your goal is not to eliminate these swings; it is decreasing the volatility of your strokes.

It is well known that tennis is as much mental as it is physical. While it is hard to precisely quantify how mental tennis is, many argue that the sport is 80% mental and 20% physical. Achieving success as a tennis player, regardless of your level, is directly correlated with your ability to deal with the pressure of competitive tennis.