. >> i hope if it happens that steffi graf is there. i would love to see her at the open. that would be great. i want to talk to you, and this is another reason why you're here, people don't realize that september is afib month. first of all, explain what it is. >> afib is an irregular heartbeat. i have afib. one out of every three people that have afib are going to have a permanent -- are going to have a stroke that will leave them permanently disabled. that's one of three who have afib. so if you have afib, what jerry west and i have done we joined with jansen to start this website, myafibrisk.com, myafibrisk.com, and you can go to this and calculate your own stroke risk and that way every time somebody does go to it, jansen will give a contribution to mended hearts which is a nonprofit peer-to-peer group network that helps heart patients, so it's very important to me personally. >> how were you diagnosed? >> i fainted. you know, i've never gotten dizzy, never fainted --. it was a long time ago. it was well over ten years. i just played tennis. we just came back to the a