Janowicz played only 4 ATP Tournaments all year and won 7 matches in those tournaments. It puzzles me that he ranks 26th.
Although, with Florian Mayer and Jurgen Melzer ranked 28th and 29th whilst both of them have a losing record this year, all of a sudden it doesn't look so weird.
you can figure it out if you look at the atp web site and check out their playing history/playing activity. the problem is that none of them are too consistent
. it's all over the place. that's why, except top guys, it's so hard to even follow who is where when it comes to rankings.