Every year, there is an air of mystery around the Wimbledon seedings. Wimbledon is the only tournament that does not seed directly based on rankings at the time the draw is made. All four Grand Slams can technically adjust the seedings as they please, but Wimbledon is the only event that actually utilizes that ability.

Wimbledon and the media often seem to enjoy the uncertainty about the coming seedings, presumably because it creates an added level of intrigue before the tournament begins. Every year, you will hear complaints and discussion somewhere about what the seeding should have been as opposed to what was announced.

However, the debate is irrelevant regarding the men’s seedings. One of the worst-known facts in the tennis world is that the Wimbledon men’s seedings are determined entirely based on a formula. (By contrast, the women’s seedings are subjective.) The formula itself is relatively simple, too. They take every player’s ATP ranking points and add bonus points for results on grass. All results earned on grass in the previous year are doubled. Also, 75% of the points from the best result on grass from the previous 52 weeks are added as well. For this year, that still includes the 2012 Summer Olympics.

Now that we know the formula, what can we expect to see when the seeds are announced? For starters, although there’s no actual relevance to the draw, Novak Djokovic and Rafael Nadal will flip seeds. Nadal has poor results on grass the past two years, while Djokovic reached at least the semifinals at Wimbledon in each year, so he has quite a cushion for the top spot because so little separates them in the overall rankings.

We may hear comments in the days leading up to Wimbledon about how it is disrespectful to Nadal that he is not the No. 1 seed, having won two of the last four majors while Djokovic has none. But there’s nothing subjective about how it’s decided. It is all about the number of points earned. And Djokovic has earned more over the past 52 weeks, when grass bonuses are included, than Nadal has.

The most important bump, though, belongs to Andy Murray. Due to his win last year and runner-up finish in 2012, Murray will be the No. 3 seed in London despite being ranked No. 5 overall. The No. 4 seed is still up for grabs. As of right now, Roger Federer sits in the No. 4 spot due to his win two years ago. However, Stan Wawrinka is close enough that if he wins Queen’s Club this week, and Federer loses early in Halle, Wawrinka could grab the No. 4 spot. This is one of the most important cut-offs, of course, because the No. 4 seed is guaranteed to avoid the top two men (Djokovic and Nadal) until the semifinals.

There is no drama for the No. 8 spot, though, because David Ferrer is locked in at No. 7 and Milos Raonic at No. 8. Those two are No. 8 and No. 9, actually, but Juan Martin Del Potro won’t be competing as he recovers from injury. After that, as usual, the top players are closely bunched up, and results this week at Queen’s Club and Halle could seriously affect their seedings.

There is one more important note about the seedings. No matter how many bonus points a player has earned for results on grass, only the top 32 in the actual rankings will be seeded. Bonus points for grass only matter after that. A player with great grass results from 2012 who has since fallen outside the top 32 cannot get back into being seeded based on those results alone.