For 16 years I was a tennis sportsbook manager and trader. My job was the other side of the counter: setting the prices you bet into, moving them when the money told me to, and managing the book's risk when a favourite started wobbling at 9pm on an outside court. You learn two things doing that job. You learn where prices come from. And you learn exactly which bettors the book was afraid of.
This site is me switching sides. The alerts on the live board fire the second a match trips one of the rules, with the live odds at that exact moment — the same situations I used to watch from the other direction, when they were the ones costing the book money.
Why prices, not picks
A price is a probability with a margin on top. That is all it has ever been. So every match on this site shows what the market thinks as a percentage, not just a decimal — because 1.55 means nothing until you know it means 64%. Once you can see the probability, you can judge for yourself whether it looks right, which is the only skill in this that matters.
What's here
The rules behind the alerts are published verbatim on the methodology page. Around them, the site covers what I would actually check before pricing a match: the full day's card with every price as a probability, who has retired hurt lately and why, live scores with in-play prices, and who is handing out 6-0 sets.
Nothing here is betting advice. It is the information I would have wanted on the desk, published for the other side of the counter.