"Underdog status" refers to a situation where someone or something is seen as unlikely to win or succeed because they are at a disadvantage or facing a stronger opponent. Full definition
Even considering underdog status, though, the league isn't doing so hot. (sbnation.com)
Team Burnham insist their man is still in with a chance of winning, but the candidate indicated he was now happy to embrace underdog status in the leadership race: (totalpolitics.com)
The best result for Arsenal is a narrow victory because it means 3 points but it maintains Arsenals underdog status going into the Chelsea game. (justarsenal.com)