Glavine pitched six scoreless innings for Class A Rome Tuesday in what he thought would be his final rehab start before being activated. He was on the disabled list recovering from August shoulder and elbow surgeries.
He signed a one-year, $1 million contract in February, and would have received a $1 million bonus if he'd been added to the active roster, with additional bonuses of $1.25 million if he stayed on the roster for 30 days and 90 days.
Wren said Wednesday it was a "performance decision" and not a business decision, and that scouts and team officials had determined that Glavine no longer had the pitches — the "stuff" — to succeed against major league hitters.
The Braves will give the rotation spot to Hanson, a 6-foot-6 right-hander who has a 1.49 ERA and .169 opponents' average in 11 starts at Gwinnett, where he's piled up an International League-leading 90 strikeouts in 66-1/3 innings.
"The decision was made on the merits, and was unanimous by Frank and Bobby and John," McGuirk said. "They believed it gave us the best chance of winning. The decision was clear as a bell.
"That doesn't take anything away from what a great guy Tommy [Glavine] is, or our respect for him. ... It's not the way we had it charted out with Tommy. It's just the way of baseball.
"It may be hard to believe, but it was on the merits. The $1 million, I wasn't too worried about that. ... Hanson needs his time."
When asked why the Braves couldn't have given Glavine at least one major league start to show what he could do, McGuirk said, "We're sort of at the point where every win counts."
Glavine has not spoken with reporters since the move, other than through text messages in which he said he was surprised and disappointed by the move and that he was "ready to pitch." He is scheduled to discuss the situation Friday in a media conference after an appearance on a local radio station.
"I wish we were spending all this time talking about how to celebrate Tom Glavine's 305 wins, instead of the other side of it," McGurk said. "There's no joy whatsoever in this situation.
"A lot's been written about the business of baseball. This is one of those times where trying to make our team better and win, causes this result."