Kim, the co-owner and president of the NFL's Buffalo Bills and NHL's Buffalo Sabres, suffered a cardiac arrest in June and needed CPR from her other daughter Kelly before paramedics arrived and restored her heartbeat.Pegula received the news after returning home to Florida from the French Open, where she lost to eventual champion Iga Swiatek but rose to number eight in the world."Suddenly I went from, 'Let's celebrate top 10 in the world' to, 'Do I need to start thinking about my career after tennis a lot sooner than I thought?'" Pegula wrote in an essay in The Players' Tribune.