A White Plains doctor used her medical skills to save a man whose heart stopped while playing tennis in Rye Tuesday night.

Dr. Lisa Youkeles noticed 44-year-old Larry Dubler laying on the ground two courts away at the Rye Racquet Club. Youkeles performed CPR on the unconscious Dubler before using an automated defibrillator to jumpstart his heart. According to Youkeles, if she had waited for the paramedics, Dubler could have sustained irreversible brain damage.

Dubler is recovering at Connecticut Hospital. Defibrillators are required in schools and at school sporting events throughout New York, which was the first state to enact such a measure.