Certain Positions In Fantasy Baseball Require Quality Backups On Your BenchWhat are the thinnest positions in fantasy baseball? Catcher? The infield positions of second base, shortstop and third base? All of the above? Yes, depth is better in the outfield and first base positions, so when you think about which players to stash on your bench, think about the ones with multi-position eligibility. They may not be the most productive on a day-to-day basis, but they have the capability to be very valuable to your team's chances of winning.