Does anyone know how times matches are factored into ratings? Was playing and got timed out at 3-6, 2-3 ( on serve). Does ratings look at this as a break/ set? Any help is appreciated. Thanks.

The NTRP algorithm uses game differentials, so a timed match like this will have its game differential extrapolated/normalized to a full 12 games, e.g. the -4 differential for the timed match becomes -5.33 for a normalized full 2 set match.

Easy there, Math Major. Allow me to translate this to English. The computer only cares about games won/lost. So the computer sees that you won 5 games to the opponent's 9. See? A math-free life is a happy life!

Except that isn't the complete answer! Yes, it sees you won 5 and the opponent won 9, that is the game differential of 4. But that isn't what it goes with. Because it wasn't a complete match and the computer likes to use complete matches, it assumes the rate at which both of you will continue to win games is the same and says this match has a game differential of 5.33 rather than 4. Sometimes ya gotta do all the math ;-)

Laughing because thanks cindysphinx I was not a math major. So if I understand schmke the computer assumes we would have lost? We were on serve and timed out. So what does that mean, sorry I'm not following. Does it look at a break/ set which isn't even accurate but looks what it was as 5 vs 9?

The computer doesn't care who won or lost even for completed matches, it only looks at how many games each player/team won.

Correct. And since this match was not a complete 2 sets, it simply looks at the game differential for the portion of the match that was completed, and figures out what the game differential would have been if each team had continued to win games at the same rate.

Yes, it only looks at the 5 vs 9 in calculating the game differential to be used. It can't know if 2-3 is on serve or down a break.

So does it also work this way for a retired match because of an injury? Say we won 1st set 6-3 but had to retire before the 2nd set and lost?

In my state, most of the matches are indoors and timed, and the second set is not entered if not completed. So the computer only sees the first set score, even if the loser is way up the second set. Tennislink won't allow you to submit a partial set score. As you can imagine, people totally drag out the second set if they win the first set. In the adjacent state, the win is based on total games if the second set is not completed (if both sets are spit, then a tie breaker is used), so you get an opposite situation when a player/team, after winning the first set, will totally tank the second set once down to get to the tie breaker.

wait wait wait so you're telling me if I lose the first set 5-7 and winning the second set 5-1 when times is called I lose?? No wonder I prefer tournaments ridiculous

To the computer, you "won" 6-3. Likewise, if you win 1-6 7-6 7-5, the algorithm will treat this as a 15-17 "loss".