Major League Baseball (MLB) has banned discrimination based on sexual orientation, the New York Daily News reported.

The league's new Collective Bargaining Agreement (CBA) adds the words “sexual orientation” to Article XV, Section A of the Basic Agreement, which states: “The provisions of this Agreement shall be applied to all Players covered by this Agreement without regard to race, color, religion or national origin.”

According to gay weekly The Dallas Voice, the inclusion is a result of a request by Rafael McDonnell, communications and advocacy manager for Resource Center Dallas, which operates the John Thomas Gay & Lesbian Community Center.

McDonnell called on baseball Commissioner Bud Seelig to include the protections based on sexual orientation and gender identity.

“I ask as an LGBT fan and on behalf of the center that you both please add sexual orientation provisions to the MLB's new CBA, and encourage each team owner that has previously not done so to add sexual orientation, gender identity and gender expression nondiscrimination protections to their team's employment nondiscrimination policies,” McDonnell wrote.

In July, the National Football League (NFL) added similar protections to its 2011 agreement.

While no professional athlete in the United States has come out gay during his or her career, earlier this year former Phoenix Suns CEO Rick Welts announced he's gay. And over the past couple of years, several straight athletes have openly advocated for gay rights, including New York Rangers winger Sean Avery, Phoenix Suns point guard Steve Nash, New England Patriots safety Bret Lockett, Carolina Panthers linebacker Nic Harris, New York Jets cornerback Antonio Cromartie, former Giants defensive end Michael Strahan, Washington Redskins wide receiver Donte Stallworth, Cleveland Browns linebacker Scott Fujita and Baltimore Ravens linebacker Brendon Ayanbadejo, to name a few.