I loved "Luckiest Man" by Jonathan Eig.
Others that were very good (I thought):
Leigh Montville's "The Big Bam"
Jane Leavy's "Sandy Koufax"
Of course, David Maraniss' "Clemente"
And one that I really liked was "A Well Paid Slave" about Curt Flood. Don't remember the writer's name, but the book...