How to play a tie break
A tie break is played when you reach six games all in any given set. A championship tie break should be played in the place of a 3rd set unless both sides agree to play a 3rd set as normal.
Who serves first?
The player that would have served in the next game starts the tie break.
Nadal just held serve to bring the set to 6-6. Federer will now start the tie break.
Which end of the court?
You remain the same end of the court as per the last game played.
Starting the tie break...
The player starting the tie break serves once from the deuce side of the court.
Their opponent now serves twice. First from the ad side of the court, then from the deuce side of the court.
Keep rotating serve every 2 points remembering to start your first serve from the ad side. You must also swap ends after every 6 points (whether that's at 6-0, 3-3, 6-6 or whatever).
Winning a tie break
The winner of the tie break is the first to reach or surpass 7 points with a 2 point margin (i.e. 7-5, 10-8 etc).
Who serves first in the next set?
The player that didn't open the tie break will serve first in the next set.
Or in other words, the player that served first in the tie break will receive.
The server starts from the opposite end of the court from where their opponent started the tie break.
Federer started the tie break, so Nadal will serve first in the next set.
Championship Tie Break
A Championship tie break is often played instead of a 3rd set. Particularly when there isn't enough time to start a whole new set. In this case, the same rules apply as per above BUT the winner of the Championship tie break is the first to reach or surpass 10 points with a 2 point margin (i.e. 10-3, 16-14 etc).