Kammala wannan jumla: An haife shi a Brawley, California, Romo ya girma a Dodgers fan. Ya halarci kwalejoji huɗu, wanda Giants suka zaɓa a zagaye na 28 na zagaye na 2005. Ya kai manyan wasannin ne a shekarar 2008 kuma ya bayyana a wasanni 45 na Giants a shekarar 2009. A shekara ta 2010, ya zama mutumin da ya kafa Giants kusa da Brian Wilson yayin da Giants suka lashe gasar cin kofin duniya ta 2010. Ya buga 1.50 ya sami matsakaicin gudu (ERA) a cikin 2011, sannan ya zama mafi kusa ga Giants a cikin 2012, yana yin rikodin sau uku a lokacin Wasannin Duniya na 2012 yayin da Giants suka lashe taken. Ya kasance
All-Star a shekarar 2013, kuma duk da cewa ya rasa rawar da ya fi dacewa a shekara mai zuwa, ya lashe lambar yabo ta uku ta Duniya yayin da Giants suka ci Kansas City Royals a gasar 2014 ta Duniya.