The ATP (Association of Tennis Professionals) and WTA (Women's Tennis Association) rankings are calculated based on players' performance in tournaments over a rolling 52-week period, reflecting their consistency and success in official competitions. Each tournament has a set number of ranking points awarded based on its prestige and difficulty, with Grand Slam events offering the most points. Generally, higher-ranked players are expected to perform better, as their ranking indicates a history of winning or progressing far in tournaments. However, tournament performance can vary due to various factors such as injuries, playing conditions, or opponent form.