San Francisco Giants announcers were in disbelief after Ketel Marte's walk-off home run for the Arizona Diamondbacks. Subscribe: https://www.youtube.com/user/BleacherReport?sub_confirmation=1 Follow us! https://www.instagram.com/f/bleacherreport https://twitter.com/BleacherReport https://www.tiktok.com/@bleacherreport https://www.facebook.com/bleacherreport Download the B/R App: https://br.app.link/oFaC6OBCxEb #mlb #baseball #sfgiants