Grow tense nearing the finish line?

Whatever job we are involved,we start it with great enthusiasm and give great importance in the beginning.And when it seems it takes a long time to finish, there is a boredom arising,but still the effort is given.And atlast you are near the target,do you get tense and excited so that you stumble on doing it.This question arises as we see cricketers tension nearing centuary and here in mylot,people reacting nearing the payout.Kindly share your views!