When a batsman has scored 90 runs, then he or she would feel little nervous to convert it into three figures, scoring a century (100 runs). Therefore this situation is referred to as batsman being on nervous nineties.
The opposing captain may design his fielding in order to create extra pressure to get the batsman out. As a result of this many batsman fail to score hundred from nineties.
Sachin Tendulkar
Batsmen dismissed on 99 are considered the unluckiest of all the nervous nineties victims. There are many batsman who have been dismissed in nineties with multiple instances of batsmen being dismissed on 99. Indian cricket icon Sachin Tendulkar tops the list by being dismissed on 99 three times in his career.{cn} Former Australian opener and now cricket commentator Michael Slater was dismissed eight times in the nervous nineties, which his co-commentators frequently delight in mentioning.