evenly matched in ability
A yojijukugo used when two people or sides are very close in skill or strength, with no clear advantage.
The two teams were evenly matched, and the game went into extra innings.
He and she are rivals of equal ability.
互角 is a more common word for 'evenly matched', while 実力伯仲 is a formal yojijukugo emphasizing ability.
伯仲 alone means 'being evenly matched', but 実力伯仲 explicitly adds the nuance of ability or skill.
A yojijukugo composed of 実力 (ability) and 伯仲 (being evenly matched, from the elder and younger brothers in a family).