World Cup knockout qualifiers are the most exciting period of the football calendar outside of the World Cup itself. In a way, I was glad Australia finished 3rd in our Asian qualifying group meaning we have to go through 2 rounds of playoffs to make it to Russia 2018.

Conventional wisdom says it’s better to be home for the 2nd leg

I was relieved we got the 2nd leg home advantage. The accepted idea is that in the 2nd leg, you know exactly what result you need and you have a greater chance of determining the result at home than you would away.

On the other hand, some people counter that playing the 2nd leg away is an advantage due to a combination of the away goals rule and the fact that more away goals are scored in the 2nd leg. Therefore, on average, the 2nd leg away team gets more of an away goals bonus.

Also, players who play their club football in the 1st leg home country only have to travel once (from the 1st leg to the 2nd leg). Whereas players who play their club football in other counties have to travel twice (from where they play their club football to the 1st leg and then from the 1st leg to the 2nd leg).

European club home and away ties

I wanted facts and found a lot of resources, including peer-reviewed academic research, about the same question in regard to the UEFA Champions League 2-leg ties (and the previous versions of the same competition).

Overall studies and results show there is no advantage to playing the 2nd leg at home. One older study disagrees and suggests that since the 1950s the 2nd leg home team wins an adjusted 53% of ties. However, they find this advantage has become nonexistent in the last 20 years.

World Cup Intercontinental playoffs

That’s all well and good for European club football which often includes ties between teams from the same country. However, home advantage is more pronounced in intercontinental playoffs because the climatic differences, cultural differences and travel times are so much greater.

I compiled the data from all World Cup intercontinental playoffs. The results show the 2nd leg home team qualifies 61% of the time. Of the 18 ties since 1958, the 1st-leg home team has won 7 and the 2nd leg home team has won 11.

It’s a small sample size but it’s all there is. The recent trend is strong with 6 of the last 7 2nd leg home teams qualifying.

Historical intercontinental playoff data

World Cup 1st leg home 2nd leg home
2018 New Zealand Peru
2018 Honduras Australia
2014 Mexico New Zealand
2014 Jordan Uruguay
2010 Costa Rica Uruguay
2010 Bahrain New Zealand
2006 Uruguay Australia
2006 Trinidad and Tobago Bahrain
2002 Australia Uruguay
1998 Iran Australia
1994 Australia Argentina
1994 Canada Australia
1990 Colombia Israel
1986 Scotland Australia
1978 Hungary Bolivia
1974* Soviet Union Chile
1970 Israel Australia
1962 Morocco Spain
1958 Israel Wales
Total wins 7 11

*Chile won this tie in a walkover. We do not award the 2nd leg home a point in this case.

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Nakul Shah

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In 2016, I worked on my first client to help write a white paper for a crypto and blockchain project they were building, and started delving deeper into blockchain and distributed ledger technology.