Mariano Rivera, Roy Halladay, Andy Pettitte, Todd Helton among newcomers on ’19 Hall of Fame ballot
Major League Baseball’s all-time saves leader, a two-time Cy Young Award winner, two batting champions, a Most Valuable Player Award winner, a multi-record-holding postseason pitcher, a pesky leadoff hitter and an infielder with the highest career fielding percentage at two positions are among 20 new candidates on the 2019 Hall…