2018 FIFA World Cup qualification – AFC Fourth Round
| Tournament details | |
|---|---|
| Dates | 12 March 2015 – 10 October 2017 |
| Teams | 46 (from 1 confederation) |
| Tournament statistics | |
| Matches played | 194 |
| Goals scored | 595 (3.07 per match) |
| Attendance | 3,424,177 (17,650 per match) |
| Top scorer(s) |
 Ahmed Khalil (15 goals)
|
The Asian section of the 2018 FIFA World Cup qualification acts as qualifiers for the 2018 FIFA World Cup, to be held in Russia, for national teams which are members of the Asian Football Confederation (AFC). A total of 4.5 slots (4 direct slots and 1 inter-confederation play-off slot) in the final tournament are available for AFC teams.
On 16 April 2014, the AFC Executive Committee approved a proposal to merge the preliminary qualification rounds of the FIFA World Cup and the AFC Asian Cup, which will be expanded to 24 teams starting in 2019. Therefore, the first two rounds of the FIFA World Cup qualifiers also acted as qualifiers for the 2019 AFC Asian Cup in the United Arab Emirates.
The qualification structure is as follows:
A total of 24 teams eliminated from World Cup qualification in the second round will compete in the third round of 2019 AFC Asian Cup qualification (which will be separate from the third round of 2018 FIFA World Cup qualification), where they will be divided into six groups of four teams and compete for the remaining slots of the 2019 AFC Asian Cup. The 24 teams will consist of the 16 highest ranked teams eliminated in the second round, and the eight teams that advance from the play-off round of 2019 AFC Asian Cup qualification which are contested by the remaining 12 teams eliminated in the second round.
The 46 FIFA-affiliated nations from the AFC entered qualification. In order to determine which nations would compete in the first round and which nations would receive a bye through to the second round, the FIFA World Rankings of January 2015 were used (shown in parentheses), as that was the latest published rankings prior to the first round draw. The FIFA Rankings of January 2015 were also used for seeding of the first round draw; however, for seeding in the second round and third round draws, the most recent FIFA Rankings prior to those draws will be used.
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