Mariano Rivera and Roy Halladay are among 20 new candidates for induction into the Baseball Hall of Fame.

Andy Pettitte, Todd Helton, Michael Young and Miguel Tejada are also on the ballot for the first time.

Barry Bonds and Rogers Clemens each appear for the seventh time.

Players remain on the ballot for up to 10 years, provided they receive at least 5 percent of the vote annually. Edgar Martinez and first baseman Fred McGriff are on the BBWAA ballot for the final time.