tim franks reports now from wimbledon. >> reporter: victory in round one should be routine for defending champions. right? wrong. serena williamsas barely played for the last 12 months. she was, she says, on her deathbed. she had blood clots on her lungs. >> it's been so hard. you know, it's just -- it's been a disaster year. but, you know, i've been praying and, you know, had my family, you know. i love tennis. to be able to come back at wimbledon is pretty awesome. >> reporter: over three sets, serena made her comeback. if not quite of biblical, then at least of deeply personal proportions. >> i didn't expect to be having the emotions. i just expected to walk off and -- but i was pretty excited. and i just thought about all the things that was happening and me not being here. and i wasn't necessarily expecting to come to wimbledon this year and making it and winning was pretty cool. >> reporter: last year, john isner and nicolas mahut's match lasted 11 hours, the longest match in history. if that was incredible, then this was unthinkable. the two men, now good friends, were drawn again this year in the first round. it was rat