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Aim: A significant impact of surgeons´ experience on outcomes of off-pump coronary artery bypass (OPCAB) grafting has been recognized through previous large-scale studies. However, a safe, effective, and concrete OPCAB-training was yet to be identified. We evaluate a safety of our OPCAB-training model with single LIMA-LAD as a reasonable first step. Methods: Between January 2010 and June 2019, 180 patients with an isolated single coronary bypass of the LAD using LIMA as an in-situ graft fulfilled the inclusion criteria. Coronary arterial bypass under cardiopulmonary bypass, utilizing other graft material, minimal invasive direct coronary arterial bypass through left sided thoracotomy, multiple diseased coronary artery disease were excluded. The primary outcome is an early postoperative outcome (MACCE: myocardial infarction, coronary re-revascularization, stroke, acute renal failure and all causes of death) between residents in training under supervision (group1: n=63) and experienced surgeons (group2: n=117). Trainees were already experienced in on-pump coronary artery bypass grafting. Results: Preoperative variables were comparable. In group 1, 7 redo procedures were included. There was no significant difference in the rate of MACCE events between the two groups including hospital mortality (p=1.000), perioperative myocardial infarction (p=0.246), stroke (p=0.655), and acute renal failure (p=0.175). Conclusion: The early postoperative outcome off pump LIMA to the LAD performed by trainees was not inferior when compared to experienced surgeons. Single LIMA-LAD was safely performed by trainees under supervision without cardiopulmonary bypass. In order to master OPCAB technique, single LAD bypass might be a reasonable first step to get into touch with the technical characteristics of this special procedure.