it's anyone's/anybody's call

it's anyone's/anybody's call

Said of situations in which an outcome is difficult or impossible to predict. The top three competitors are so evenly matched that I really don't know who will win this race—it's anyone's call. At this point it's anybody's call who will win the Science Fair. We'll just have to see what the judges say.
See also: call
Farlex Dictionary of Idioms.
See also:
  • be anyone's/anybody's call
  • anyone's/anybody's call
  • (only) time will tell
  • time alone will tell
  • time will tell
  • you never know
  • you never know with (someone or something)
  • in a dead heat
  • trade blows
  • you can never tell with (someone or something)