For several years, MTF has had it's very own live ranking system, run by
MTF's ranking system is the most accurate and exhaustive system for live rankings.
Now, MTF's live ranking system has got an upgrade, with many added features. You can apply your own filters (by age/country/career high, etc), can see forecasts for future rankings, and rankings breakdown even for live rankings, and many more new and exciting features. And even more is being added as we speak, including a detailed ATP ranking history like you have never seen before. All of this can be found in a new interactive website(called open era rankings) here: ATP Open Era & Live Rankings
. The same can also be accessed by clicking the "LIVE ATP" button on the top bar of every page on MTF.