With a Lucky loser, there were ethical issues, including the possibility of bribery, so a new policy was introduced in Grand Slam tournaments (also called majors).
For example, a high-ranking player paired against a lower-ranked friend might deliberately lose the match to help his friend gain entry to the tournament, if the first player had already clinched a lucky loser spot. The possibility of bribery was also a concern. Shortly thereafter, a new policy was introduced in Grand Slam tournaments. The Grand Slam tournaments, also called majors, are the four most important annual tennis events. 
