The question of why sports teams are more likely to win on their home turf … yes, it has been studied. The Boston Globe writes about it.
Prime suspects:
- Visiting team has to travel
- Familiarity with the field
- Support from fans making referees partial
- Support from fans making teams play better (this is the most commonly invoked explanation I believe – “thanks to our fans for their great support”)
Though I do recall reading about another theory that home teams tend to have higher testosterone levels implying that they somehow see themselves as “defending” their home.
All interesting because the home-field advantage is such a basic fact of sports.