neck and neck
US /ˌnek ən ˈnek/
UK /ˌnek ən ˈnek/

1.
codo a codo, muy reñido
very close in a race or competition
:
•
The two runners were neck and neck as they approached the finish line.
Los dos corredores estaban codo a codo al acercarse a la meta.
•
The election results were neck and neck until the very end.
Los resultados de las elecciones estuvieron muy reñidos hasta el final.