It is wonderful. The fielder catches the ball every time, even if it requires leaping in the air to catch the ball. The tennis player returns even the most difficult shots with ease. On a Bad Day the cricketer fluffs even the most easy balls and the fielder misses most catches. Similarly the tennis player does not seem to be in the right place at the right time.
Human beings are subject to many biorhythms.
We know that the hormonal levels have a monthly cycle. More research needs to be done on the physiological causes of the fluctuations.