BOSTON -- Boston Red Sox third base coach Mike Cubbage had a diabetic seizure and collapsed on the field during Saturday night's home opener against the Baltimore Orioles. He was expected to make a full recovery.

"He's doing well,'' Red Sox physician Bill Morgan said after the game, adding that Cubbage would be kept overnight at the hospital for observation. "He's wide awake, and if everything comes out normal in the morning, he'll be discharged.''

Baltimore starting pitcher Jason Johnson is also diabetic. The Orioles training staff -- in the third base dugout and the first to see what was going on -- went out to help Cubbage and put some sugar in his mouth.

"Once they knew what it was, they got right to him,'' Johnson said. "It was kind of scary. It's tough to see, because I've never really seen another diabetic have a reaction.''

Cubbage should have been leaving the field as the Red Sox took their positions in the top of the sixth. Baltimore second baseman Jerry Hairston noticed a problem as he was leaving the field, and he and Orioles third base coach Tom Trebelhorn rushed to help Cubbage.

"I was holding him and kind of felt him shaking. I wanted to hold him until our trainer got there,'' Hairston said. "When you see him go down, it kind of shakes you a little bit.''

Along with an on-field police officer, they waved for help from the Red Sox dugout. The ballpark fell silent as medical personnel attended to Cubbage before he was wheeled off on a stretcher. Bench coach Jerry Narron took over at third.

The game resumed after a five-minute delay and the Orioles won 13-6.

The Red Sox confirmed Cubbage had a diabetic seizure due to too much insulin, and not enough sugar, in his blood. He was given intravenous glucose and he responded immediately, Morgan said.

Red Sox manager Grady Little said Cubbage wears a pump on his belt that is supposed to regulate his blood sugar, but it apparently malfunctioned. It was not clear whether Cubbage would return for Sunday's game.

The game was also delayed nine minutes in the fourth inning after plate umpire Jerry Layne was hit by a pitch. He did not return.