The pitch from the Dodgers' Brad Penny, the first of the inning with Garrett Atkins batting, ticked off the glove of Dodgers catcher Russell Martin. Danley went straight to the dirt behind home plate.
Shortly thereafter, players were ordered from the field and an ambulance was driven to the plate area, where Danley was placed on a stretcher after being attended to by Dodgers trainers Stan Conte and Todd Tomczyk.
The ball hit him on the jaw and he lost consciousness "for a couple of seconds," according to a member of the Dodgers' public relations staff, adding that when the ambulance took him away, he was coherent, breathing and conscious. Danley was taken to Good Samaritan Hospital, and Dodgers medical personnel went with him.
"The Dodgers' training staff was great," third-base umpire Greg Gibson said. "I'm very grateful to them for the support -- getting the ambulance and everything they did for us. Sometimes with our relationship, teams don't agree with what we do, but we're a family."
After the game, which was delayed 18 minutes while Danely was attended to, Gibson said he understood Danley was doing OK, and said he was going to the hospital to see him.
Danley, 46, has been an umpire in the Majors since 1998. He is the crew chief working with Angel Campos at first base, Brian Runge at second and Gibson. Campos took over behind the plate.
"He's solid. You actually like the guy," Martin said. "They're out there doing their jobs. Being a catcher, that's the last thing you want. You're trying to build a positive relationship. It hit him right in the side of the mask. it was loud. I'm sure Brad put a little extra on it because Atkins hit one [for a home run] earlier."
Saturday night's game was in Danley's hometown of Los Angeles, and his mother was at the game.
"I hope he's all right," Martin said. "I told him I was sorry a couple of times. I don't know if he heard me. It was like he got hit by a Tyson uppercut. That's what it sounded like."
Thomas Harding is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.