Since being released from the hospital on Tuesday after quadruple bypass surgery, Rosener, 75, is relaxing at his Newport Beach home and will soon start physical therapy in hopes of returning to the courts in a couple of months.
"My arteries are only a week old now, so I may have to play in a lower age division," he joked. "I was just incredibly lucky that they recently got the defibrillator and the training at the club, and that the paramedics got there in nine minutes.
"If you have to have a coronary problem, plan to have it where I did."
While playing his regular noon tennis game at the club on June 13, Rosener suffered a heart attack as he knelt to fetch a tennis ball, hitting his head and falling unconscious to the ground.
Club staff and other members responded immediately. Bud Brandt and Dr. Donald Spitz, who were playing on a nearby court, ran over to deliver CPR while Conter rushed to retrieve the brand new automated external defibrillator (AED).
Though she was anxious on the way over, her adrenaline and the ease of the machine calmed her nerves.
"When I got there it was a bloody mess, but I just got out the pads and put them on him," Conter said. "I'm not the big hero, it's the AED because it's so user-friendly."
Doctors at Hoag Memorial Hospital Presbyterian told Rosener that four of his arteries were 95% blocked, leaving him wondering how he's been getting along so well.
Club owner and longtime friend Ken Stuart said Rosener is "as fit as can be," though several family members on his mother's side have experienced heart problems.