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If this is the Giants' biggest issue of the spring, then I'd say they are in pretty great shape.
Currently the Giants bullpen has 11 of its 12 components set with the five starters, Javier Lopez, Jeremy Affeldt, Brian Wilson, Ramon Ramirez, Sergio Romo and Santiago Casilla. Officially the last spot in the bullpen comes down to a battle between Dan Runzler, Ryan Vogelsong, Guillermo Mota and Jeff Suppan.
As an earlier article of mine noted, Suppan looked primed to take that final spot earlier in the spring. The Giants' true bullpen need is a "sixth" starter, a guy who can pitch long innings in relief and start reliably should an injury occur in the rotation. Though he was coming off a bad year, Suppan had a lot of experience (which the Giants organization always seems to over-value if anything) and was having a great spring. A recent string of bad (and I mean BAD) outings has basically taken Suppan out of the conversation altogether.
The Giants don't need another middle-relieving righty in Mota, so I think he's out of the picture as well. That leaves Runzler and Vogelsong, guys on two very different career paths.
Runzler is a flame-throwing lefty who could be anything from a future closer to a dangerous reliever to a starter. The Giants are just not sure what to do with the soon-to-be 26-year-old. His innings are being extended to test his durability, and so far he seems to be doing just fine. While they may change their minds, the Giants have never been a team that goes with the younger, more inexperienced guy over a veteran (even one that hasn't been good enough to pitch in the states for most of his career).
Vogelsong has been downright fantastic this spring, and after seeing him throw against the Rangers he seems to be for real (at least for now). He is 2-1 with a 2.13 ERA and a 1.16 WHIP so far, which is pretty good for a guy trying to be the team's sixth man. At this point, the edge has to go to Vogelsong because of his career-starter status and uncertainty with Runzler. However, Vogelsong could easily perform poorly early and, if that's the case, Runzler will be right there to take over.