underdog
/ˈʌndədɒg ˈअन्डडॉग्/ noun [C] a person, team, etc. who is weaker than others, and not expected to be successful दूसरों से कमज़ोर और हारने की संभावना वाला व्यकि्त, दल आदि; गौण प्रतियोगी
Bangladesh were the underdogs, but managed to win the match by two wickcts.