At about 6 p.m. Tuesday, April 15, Shannon Schartz, an avid tennis player and coach, was playing the game he loved. Then, he suddenly collapsed on the court gasping for air.He had suffered a heart attack.His tennis buddies and Club One Fitness employees immediately called 911. “The ambulance arrived within a few short minutes,” and Great Bend Fire Department emergency medical technicians immediately worked to save him, his wife Jennifer Schartz said.