Bayliss, 30, spent the 2010 season in the Astros' organization at Double-A Round Rock and went 1-4 with a 3.58 ERA in 43 relief appearances. He has spent parts of three seasons in the Major Leagues, including stints with the Royals (2005) and Pirates (2006-07), posting a 5-4 record with 54 strikeouts in 64 innings. Originally drafted by the Royals in the seventh round of the '02 First-Year Player Draft, the North Adams, Mass., native has a 4.13 ERA with 41 saves over nine Minor League seasons.
Carter, 28, played in 100 games for the Mets in 2010, batting .263 with four home runs and 24 RBIs; he had a .328 average as a pinch-hitter, including a home run and 10 RBIs. He began last season at Triple-A Buffalo, where he hit .336 with six home runs and 22 RBIs in 29 games before his promotion on May 11. Previously, he played in the D-backs and Red Sox organizations and served two Major League stints with Boston, in 2008 and '09. In seven Minor League seasons, the Stanford graduate has hit .306, with 130 home runs. Recent Rays addition Sam Fuld played alongside Carter at Stanford.
Hayhurst, 29, has played eight professional seasons, including two stints at the Major League level with the Padres (2008) and Blue Jays ('09). In 15 games with Toronto in '09, the reliever posted a 2.78 ERA and held right-handed hitters to a .220 average before spending all of last year recovering from right shoulder surgery. The Kent State University graduate was selected by the Padres in the eighth round of the '03 First-Year Player Draft. He is the author of "The Bullpen Gospels," a book that chronicles his life in the Minor Leagues.
Mayora, 25, spent the 2010 season at Double-A Tulsa in the Rockies' organization and hit .286 with 30 RBIs in 66 games. The utility infielder was signed out of Venezuela as a non-drafted free agent by Colorado in 2003 and has hit .286 with 95 stolen bases in eight professional seasons.
Olmedo, 29, hit .284 with 55 RBIs during the 2010 season at Triple-A Nashville in the Brewers' organization. The shortstop played in the Rays' organization in '09, hitting .250 in 115 games at Triple-A Durham. He has spent parts of five seasons in the Major Leagues with the Reds (2003-06) and Blue Jays ('07). The Venezuela native was originally signed as a non-drafted free agent by the Reds in 1999.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.