The Super Series cricket event sees the number one side in the world take on a rest of the world team over three one-day matches and one special Test match that lasts six days.
The people who run world cricket, the International Cricket Council (ICC), have put the Super Series together.
When the Super Series was thought up Australia were the top-ranked Test side in the world as well as the one-day world champions.
Despite their Ashes defeat to England they're still the team the World XI are trying to beat in the Super Series.
The squads of players aren't being used for both events, with Andrew Flintoff the only English player to be selected for both one-day and Test teams.
Kevin Pietersen was selected in the one-day squad and Steve Harmison has been picked for the Test squad.
Rest of the World teams have played the game before, but the most recent match was in 1987, when the MCC celebrated it's 200th birthday with a draw against a Rest of the World line-up.