Golden State Warriors coach Mark Jackson:
"As a Christian man, I have beliefs of what's right and what's wrong. That being said, I know Jason Collins, I know his family ... and (I'm) certainly praying for them at this time."
ESPN.com's Tim Keown:
Is Collins a hero? To some, sure. But to almost everybody else, he's just a guy going about his life.
We were expecting a gasp, and in the end, we got a shrug.
And that's a good thing.
It's a big world out there. The insular world of major American men's sports just became a more complete part of it.
CBSsports.com's Gregg Doyel:
This is Jason Collins' life, and he's ready to live it in the open. More athletes will join him, because the world is changing. Hateful people like Dallas pastor Robert Jeffers, people who say gay men are going to hell, still have followers but their grasp on the world is slipping. Good doesn't always beat evil, but it's starting to win this battle. Jason Collins landed an enormous shot Monday. More will follow. Soon there will be so many publicly gay athletes that we won't write about it. It won't be news.
FoxSports.com' Bill Reiter:
This is a remarkable moment in America's struggle for equal rights, and an equally significant one in sports. Collins is the first active openly gay man in any of the major American team sports. This is no small thing, no trivial matter that should be dismissed because he is not a star.
After the initial burst of support, it is going to be important to remember that this is a seminal moment not because what he did is easy or easily done but because it will absolutely be very hard and, in ways big and small, alienating.
Miami Heat guard Dwyane Wade, on Twitter:
"Jason Collins showed a lot of courage today and I respect him for taking a stand and choosing to live in his truth. #nbafamily"
Los Angeles Lakers guard Kobe Bryant, on Twitter:
"Proud of @jasoncollins34. Don't suffocate who u r because of the ignorance of others #courage #support #mambaarmystandup #BYOU"
Former U.S. national soccer team player Robbie Rogers, who came out as gay earlier this year, writing on Twitter:
"I feel a movement coming."
Detroit Lions cornerback Alphonso Smith, on Twitter:
"Ppl are so sensitive-I have the RIGHT to not give that behavior any applause;I love everyone-don't hate anyone; not praising it! Excuse me! ...
"I haven't judged one single soul... Just saying; those of you should consider not praising this act.. That's all! Gone for the day!"
Former tennis champion Martina Navratilova, who came out as gay during her playing career, writing for Sports Illustrated:
Now that Jason Collins has come out, he is the proverbial 'game-changer.' One of the last bastions of homophobia has been challenged. How many LGBT kids, once closeted, are now more likely to pursue a team sport and won't be scared away by a straight culture?
New York Mets third baseman David Wright:
"If you can play the game, I don't care the color of your skin, sexual orientation, religion. Come on in, welcome."