SAN FRANCISCO — San Francisco Giants pitcher Joe Martinez should have been celebrating his first week in the major leagues.

Instead, the rookie right-hander went to the hospital after getting hit in the head by Mike Cameron's line drive Thursday during San Francisco's 7-1 win over Milwaukee.

Martinez made his major league debut Tuesday and was the winner in the Giants' opener. Two nights later, he was two strikes away from walking off the mound when he was knocked to his knees and bloodied.

Martinez was conscious throughout the trauma, and was able to leave under his own power. His forehead was bloody and his right eye swollen, and he was taken for a CT scan and evaluation.

"He was bleeding quite a bit," Giants manager Bruce Bochy said. "That ball was smoked. He didn't have a chance."

The ball hit Martinez near his right temple and caromed off the field into foul territory near the Brewers' first-base dugout.

Players on both sides winced at the frightening scene as team trainers rushed to Martinez's aid. After a few minutes, the 26-year-old pitcher walked away with a cloth held to his nose.

"It looked like it hit him solid, I don't think it touched his glove at all," said winning pitcher Matt Cain (1-0). "It's really tough to see and witness firsthand. All of us are definitely feeling it."

Cameron, who was credited with a double, was beside himself. He grimaced, looked away and slowed while running to first base.

Cameron knelt at second base with his head in his hands while Martinez was being treated. Cameron stayed down even after Martinez left, and San Francisco players came up to console the Brewers veteran.

"You just hope that the young man is all right, that everything is good and that he's safe first and foremost," Cameron said. "I just hope that he gets a chance to go back on the field again. I couldn't stop shaking. It's kind of a helpless feeling. I was just trying to pray for him because I know how dangerous that can be."

Cameron is no stranger to such a bloody play. He was involved in a head-to-head collision with fellow Mets outfielder Carlos Beltran while chasing a ball in August 2005, leaving Cameron with two broken cheekbones, a broken nose and a concussion. He missed the rest of that season.

"It's unbelievably scary because that can happen to any pitcher," said Manny Parra (0-1) who took the loss. "Balls are going by your head every game. It's extremely unfortunate and something you don't ever want to see."