In order to establish the seedings for the grand slam events.
It's basically rankings in Tennis.
It is the Association of Tennis Professionals, responsible for the mens tour and world rankings of male tennis players.
Novak Djokovic is the top male tennis player on the ATP rankings.
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Katerina Vankova, CZE
A ladder is simply the rankings of tennis players. For instance on the laddder on my tennis team I am number 2, this means that there is only one person higher than me and plenty of people lower than me.
They are updated (almost) every Monday. See the link for further information.
That depends on who you ask. Most will say Roger Federer, tennis master. If you want to go by rankings, then Rafael Nadal is the number one. Federer is number two.
Professional tennis players' rankings will not change until the Monday following the end of the given tournament. This is to allow the ATP (men's tour group) or WTA (women's tour group) time to enter the scores into their respective computer systems, which then calculates the new rankings. This also allows for unexpected delays, such as might be caused by weather, darkness, etc. The media may speculate as to what a player's ranking will be following an event and prior to the release of the latest rankings, but, obviously, that is not official.
A column chart is good for showing rankings.
the 'wc' which is in front of the players instead of rankings means "Wild Card" which the tournaments summoned like a wild card
In World Rankings for December 2010... Woman - GAO Jun Man - XIAO Han