It is so popular that you must apply for a ballot every year between August to December for the following year. You can also join the queue to buy the tickets on the day of the match if you really want to try your luck you. You might need to arrive by 6:30 am.
I told that if you simply want to go to a game, you should apply for the Queen Series as they are easier to get.
You can also come here and visit the museum and take a 90 minute tour of the grounds. Even though I am not a huge tennis fan, I enjoyed this and it was the highlight of my dad's visit.
For more about the history of Wimbledon, click here.
All the Best!
American to Britain