How tennis has changed over time

- A tennis racquet can be made now out of any material, size and weight
- The tennis strings have developed by providing more spin and control for hitting the ball
- There are more tennis tournaments now then there used to be.
- People can now analyze there games so they can become better tennis players
- From playing the sport people have made more friends
- People have learned more strategies for playing tennis
- The sport has created more school competitions to be the best tennis school

How have people been able to decide who can play in a certain tournament?
How do rankings shape how good a tennis player is?

Personal Connection- From playing tennis all I know is that there are rankings that decide if you are high enough to play in a certain tournament.

http://find.galegroup.com/gic/retrieve.do?sgHitCountType=None&sort=DateDescend&tabID=T001&prodId=GIC&resultListType=RESULT_LIST&searchId=R1&searchType=&currentPosition=1&qrySerId=Locale%28en%2C%2C%29%3AFQE%3D%28KE%2CNone%2C6%29tennis%3AAnd%3AFQE%3D%28KE%2CNone%2C7%29changed%3AAnd%3AFQE%3D%28KE%2CNone%2C4%29game%24&userGroupName=hins30136&inPS=true&docId=CX3411400020&contentSet=EBKS&docId=CX3411400020&docType=EBKS

http://www.sportanddev.org/en/learnmore/history_of_sport_and_development/