Tennis has four "Crown Pearl" events. Why is it called this name?

Crown Pearl Competition is a new competition level of WTA. The name given to this level, PremierMandatory, translated as "Crown Pearl" in Chinese, replaced the original WTA 1 competition with a prize level of 4.5 million US dollars. It started in 2009 and is second only to the four Grand Slams in terms of competitive level.

In 2009, China Open will be upgraded as scheduled, becoming the highest comprehensive international tennis tournament in Asia, and the only comprehensive tennis tournament in Asia that includes both men's and women's competitions and youth competitions. The total prize will reach 6.6 million dollars, comparable to the historic Indian Wells Station, Miami Station and Madrid Station.

At the same time, WTA cancelled the original 1, 2, 3 and 4, and the newly defined levels are PremierMandatory(4-stop championship), Premier5(5-stop championship) and Premier( 1 1 stop championship), with different bonus levels. Among them, Indian Wells Station, Miami Station, Beijing Station (China Net) and Madrid Station are one of the four highest prime ministers' palaces in the world newly launched by WTA, second only to the four Grand Slams. The top 50 female players in the world must participate in the competition, otherwise they will face severe punishment from WTA; Even if the players can't participate in the competition due to injury, they should rush to the local area to cooperate with commercial promotion.