A close-run thing
Definition 1 of 1
Pro Tip 1/3Intensity Emphasis
Use it to convey the emotional intensity of a highly competitive situation. 
The spelling bee was a close-run thing, with tension in the air until the final word.
Pro Tip 2/3Sports Appropriate
Often used in sports to describe matches where the outcome is uncertain until the end. 
Yesterday's match was a close-run thing; either team could've won.
Pro Tip 3/3Outcome Uncertainty
Highlights that the result was not easily predicted, enhancing the suspense. 
After a tough qualification process, her admission was a close-run thing.
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