Baxter is, of course, best known for his catch that helped save Johan Santana's no-hitter last year. He's bounced back and forth between the big leagues and Triple-A Las Vegas this year, though, and he's hit just .208/.325/.277 when with the Mets.
Harang was signed to a minor league deal by the Mets last week. He made 22 starts with a 5.76 ERA and 4.69 FIP for the Mariners this year before he was released. The 35-year-old figures to give the Mets some starts down the stretch as they wind down Zack Wheeler's season.
Centeno, a catcher, is 23 years old and has not yet appeared in the big leagues. He had just a .711 OPS between Triple-A and a brief stint in Double-A this year, and he did not make Amazin' Avenue's Top 50 Prospects before the season.
Missing from the list for now is 23-year-old shortstop Ruben Tejada, who is expected to join the team shortly after the aforementioned trio. The delay should allow the Mets to push back Tejada's arbitration eligibility.