How do tennis ranking points work?

As an expert in the field of tennis, I can explain how the tennis ranking points work. The ATP Rankings are a system used to determine a player's eligibility for entry into tournaments as well as their seeding through a player's performance over a period of time. Here's a detailed breakdown: 1. Grand Slams: Points are awarded for each round a player advances in the four Grand Slam tournaments (Australian Open, French Open, Wimbledon, and the US Open). 2. ATP World Tour Masters 1000: These are the highest level of tournaments outside of the Grand Slams. Players earn points based on their performance in these eight mandatory tournaments. 3. Nitto ATP Finals: This is the season-ending championship event for the top eight singles players and doubles teams. Points are awarded for each round won. 4. Best Six Results: Players count their best six results from all ATP World Tour 500, ATP World Tour 250, and ATP Challenger tournaments towards their ranking. 5. Ranking Period: The ranking period is typically a one-year sliding window, meaning that points from events during the current year are added to the total, and points from the same events from the previous year are removed. 6. Bonus Points: Players can also earn bonus points for defending titles or reaching certain milestones, but these do not count towards the ranking. 7. Loss of Points: If a player fails to defend points from the previous year, their ranking can drop significantly. 8. Injury Protection: The ATP provides a rule that allows players to use their best score from the previous 18 months if it's better than their current score, due to injury. The ATP Rankings are updated weekly and are crucial for determining a player's standing in the tennis world.

The year-end ATP Rankings is based on calculating, for each player, his total points from the four (4) Grand Slams, the eight (8) mandatory ATP World Tour Masters 1000 tournaments and the Nitto ATP Finals of the ranking period, and his best six (6) results from all ATP World Tour 500, ATP World Tour 250, ATP Challenger ...