That box score referenced includes a common error by USA Today, whereby holds are erroneously listed on the box scores. No other media web sites listed Nelson with a hold yesterday. We've talked about holds more often than football announcers. I still think the hold is not a generally accepted stat for most purposes. But again, to each their own.
Every league is different.
But Mike Berman will be here a few more minutes. If he does, the Orioles may well pull someone out of the stands to pitch the ninth. I'd say B.J. Ryan would get some chances as well, but he bombed in that role earlier in the season. The Orioles and Cardinals have also apparently made another deal, but there's no word on who's involved. They're both about the same.