The trio was named to All-Star rosters as injury replacements on Friday.
Muncy will take the place of Nationals third baseman -- and fellow first-time All-Star -- Anthony Rendon, who had said recently that he's been battling various ailments leading up to Tuesday's All-Star Game at 7:30 p.m. ET on FOX in Cleveland. Muncy, who competed in last year's Home Run Derby, entered play Friday with 21 homers and 59 RBIs in 86 games this season.
As for the American League squad, Bieber and Hendriks will replace Rays right-hander Charlie Morton and Rangers left-hander Mike Minor since the latter two are scheduled to pitch on Sunday. Morton (2.36 ERA) and Minor (2.54) entered play Friday with the top two ERA marks in the AL.
Bieber, who is 7-3 with a 3.54 ERA, is averaging 11.5 strikeouts per nine innings, which ranked fourth among qualified AL starters entering Friday. He will join Tribe teammates Carlos Santana, Francisco Lindor and Brad Hand for the Midsummer Classic in front of Cleveland’s hometown fans.
Hendriks, meanwhile, began Friday with a 1.29 ERA in 40 outings this season and will join A's third baseman Matt Chapman for the All-Star Game.
The All-Star Game presented by Mastercard will be televised nationally by FOX Sports; in Canada by Rogers Sportsnet and RDS; and worldwide by partners in more than 180 countries. FOX Deportes will provide Spanish-language coverage in the United States, while ESPN Radio and ESPN Radio Deportes will provide exclusive national radio coverage. MLB Network, MLB.com and SiriusXM also will provide comprehensive All-Star Week coverage.