I believe that if you listed every major league player in history alphabetically, tonight's starting pitchers would be adjacent to each other. I wonder if that's ever happened before...
Originally I thought about Joe and Phil Niekro, but nowadays Lance splits them.
BTW, the pitcher right before Volquez alphabetically seems to be Bill Voiselle, who was the only major league player to wear his hometown name on his uniform (he was from Ninety-Six, North Carolina).