Generally speaking, there’s nothing wrong with some key competition in the workplace. Whilst gunning for the same promotions or projects can seem infuriating at the time, having a workplace rival keeps employers alert and ensures that they push themselves to achieve great things.
However, whilst healthy rivalry can be positive, it must be coupled with mutual respect between the two parties. If the worker finds that their workplace rival is actively sabotaging their work or attacking them personally, then, unfortunately, the relationship has become an issue.