The 9th season of Overwatch Competitive mode has begun. There are a few changes to some heroes, that was announced 2 days earlier. We will also be witnessing Blizzardworld, the latest map being included in the competitive play. The season will last around 60 days or so.
Before you can kick off your competitive career, every player must first complete 10 placement matches to obtain their initial skill rating. This rating will be a number between 1 and 5000, with higher values indicating a greater skill level. Players will also be assigned a tier based on their rating—Bronze, Silver, Gold, Platinum, Diamond, Master, or Grandmaster—and climbing into the next tier is possible as you improve.
Source : Playoverwatch Blog