Thanks, jjper1!
Here are your 25 calendar dates:
February 16, 2015 - Bill Pecota
February 28, 2015 - Aroldis Chapman
April 3, 2015 - Koji Uehara
April 4, 2015 - Tris Speaker
April 8, 2015 - Charlie English
April 28, 2015 - Barry Larkin
April 30, 2015 - Jeff Reboulet
May 17, 2015 - Elmer Steele
May 27, 2015 - Jeff Bagwell
July 7, 2015 - Chuck Knoblauch
July 30, 2015 - Tom Pagnazzi
July 31, 2015 - Art Nehf
August 5, 2015 - John Olerud
August 12, 2015 - Christy Mathewson
September 12, 2015 - Spud Chandler
September 16, 2015 - Tim Raines
October 10, 2015 - Bobby Tiefenauer
October 13, 2015 - Trevor Hoffman
October 14, 2015 - Carlos Marmol
October 22, 2015 - Jimmy Foxx
November 1, 2015 - Gary Redus
November 12, 2015 - Joe Hoerner
December 4, 2015 - Jesse Burkett
December 12, 2015 - Garrett Atkins
December 30, 2015 - Sandy Koufax