Once that happens, Kovacs says, you think about your compromised condition rather than the ball zinging toward you, and you lose concentration and start making unforced errors.

• 一旦这样的情况发生；你就会老想着自己大打折扣的身体状态而不是向你嗖嗖飞来的网球了；于是你丢失了场上的注意力进而开始制造非受迫性失误.