Stockholm Open
In short
The Stockholm Open is an annual professional men's tennis tournament held in Sweden. It is the oldest indoor ATP tournament in the world.
In plain words
Professional tennis players compete in this event on hardcourts. It takes place every November at the Royal Tennis Hall in Stockholm.
A simple example
A top-ranked player travels to Sweden in November to compete for points and prize money in this indoor tournament.
Why it matters
It is a historic event that has been running since 1969. It is unique because it is played in an arena built specifically for tennis.
Easy to mix up
Do not confuse it with the Swedish Open, which is a different tournament played on clay.