"It just kind of fell onto us," said Castro, who attended Stanford. "We've been kind of splitting it 50-50. He was able to go to some meetings I wasn't able to go to. He thinks he has the leg up on me right now, but we'll see about that."
Castro and Manzella were co-alternates last year to player rep Tim Byrdak, who isn't on the club anymore. The two players toured the MLBPA offices in New York when the Astros played at the Mets last year, and they are taking their assignments seriously.
Manzella, a graduate of Tulane, attended MLBPA meetings at the Winter Meetings in Lake Buena Vista, Fla., in December.
"Jason was in school in the fall, so I was actually the one who was able to attend," Manzella said. "It was a really interesting couple of days for me, because I was able to learn a lot of things. It was one of those things where you kind of take everything in."