Medium Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6.0
Fatigue; Distraction; Situational Awareness; Workload
ATC Issue All Types; Airspace Violation All Types; Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Procedure
The South Departure Controller climbed their Aircraft Y to 15;000' right into my Aircraft X who was in my arrival corridor; airspace that I own 7;000' and above. Because of the vast airspace I was looking at; the tags were overlapped and I didn't see that Aircraft Y was climbing through 5;000' (standard departure altitude off ORD) and wasn't aware of this until Aircraft X reported responding to an RA.We're working a lot of overtime every week; but people need to pay attention more. These planes were pointed right at each other and it makes me uneasy when there's so little going on and someone creates a situation in which TCAS basically saves a near mid-air. I don't know if it was because it's their 6th day; it's an early shift or a combination of both; that person needs to not be working planes if they're so tired or out of it that something like this can happen.
Approach Controller reported another Controller climbed an aircraft into their airspace without coordination causing an NMAC.