LaHair, 28, was named the 2011 Pacific Coast League Most Valuable Player after leading all of Minor League Baseball with an Iowa franchise-record 38 home runs. He led the PCL with 76 extra-base hits, 303 total bases, a .664 slugging percentage, a 1.070 OPS and was tied for first with 109 RBIs.
LaHair's 38 home runs set a franchise record, surpassing Joe Hicks in 1984. LaHair joined Mel Hall (1982) as only the second player in Iowa Cubs history with at least 30 homers and 30 doubles in the same season.
Beliveau, 24, combined to go 6-2 with five saves and a 1.57 ERA in 53 relief appearances between Class A Daytona and Double-A Tennessee. He struck out 89 and walked 19 over 74 1/3 innings combined.
Beliveau began the season with Daytona, where he went 0-1 with two saves and a 0.52 ERA in 12 relief outings to earn the promotion. With the Smokies, Beliveau went 6-1 with three saves and a 1.89 ERA in 41 relief appearances.
Originally selected by the Cubs in the 18th round of the 2008 First-Year Player Draft out of Florida Atlantic University, Beliveau is 17-9 with 10 saves and a 2.69 ERA in four professional seasons.
Beliveau will pitch for Team USA this fall.