The San Francisco Giants selected Sergio Romo in the 28th round of the 2005 MLB draft out of Divison-II Colorado Mesa University.
He began his pro career as a starter, but transitioned to the bullpen in 2006 when he posted a 2.53 ERA and 0.94 WHIP with 95 strikeouts in 103.1 innings spanning 10 starts and 21 relief appearances at Single-A.
The right-hander made his MLB debut on June 26, 2008, and he went on to post a 2.12 ERA and 0.71 WHIP with five holds in 29 appearances.
Following that performance, he began the 2009 campaign as the No.