ST. PETERSBURG, Fla. - J.A. Happ raised his glove in front of his face as quickly as he could, a futile attempt to shield himself from the line drive headed straight for his temple.

It was too late. Thwack!

The sickening sound of a sharply hit baseball striking the Toronto pitcher's skull could be heard all the way up in the press box.

And then, sheer silence.

Happ's frightening injury Tuesday night at Tropicana Field left players on both teams shaken and revived questions about whether Major League Baseball is doing enough to protect pitchers who often find themselves in harm's way on the mound.

"There are always close calls," Blue Jays manager John Gibbons said. "It wakes you up, man — that's for sure."

Story continues below slideshow

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  • J.A. Happ

    Toronto Blue Jays starting pitcher J.A. Happ reacts after being hit in the head by a line drive from Tampa Bay Rays' Desmond Jennings during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • Desmond Jennings

    Tampa Bay Rays' Desmond Jennings reacts while medical personnel attend to Toronto Blue Jays starting pitcher J.A. Happ after during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. Happ was hit by a line drive off of Jennings' bat. (AP Photo/Mike Carlson)

  • J.A. Happ

    Toronto Blue Jays starting pitcher J.A. Happ reacts after being hit in the head with a line drive off the bat of Tampa Bay Rays' Desmond Jennings during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • Desmond Jennings

    Tampa Bay Rays' Desmond Jennings reacts as his line drive hits Toronto Blue Jays starting pitcher J.A. Happ in the head during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • Munenori Kawasaki, Brett Lawrie, J.P. Arencibia, Edwin Encarnacion

    Members of the Toronto Blue Jays, from left, Munenori Kawasaki, Brett Lawrie, J.P. Arencibia, and Edwin Encarnacion look on as starting pitcher J.A. Happ is attended to by medical personnel after being hit in the head by a line drive off the bat of Tampa Bay Rays' Desmond Jennings during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • Toronto Blue Jays v Tampa Bay Rays

    ST. PETERSBURG, FL - MAY 07: Pitcher J.A. Happ #48 of the Toronto Blue Jays lies on the mound after he was hit by a line drive from the Tampa Bay Rays during the game at Tropicana Field on May 7, 2013 in St. Petersburg, Florida. (Photo by J. Meric/Getty Images)

  • J.A. Happ

    Toronto Blue Jays' J.A. Happ is attended to by medical personnel as he is taken off the field on a stretcher after being hit in the head by a line drive by Tampa Bay Rays' Desmond Jennings during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • J.A. Happ

    Toronto Blue Jays starting pitcher J.A. Happ is taken off the field on a stretcher after being hit with a line drive off the bat of Tampa Bay Rays' Desmond Jennings during the second inning of a baseball game Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

  • Toronto Blue Jays v Tampa Bay Rays

    ST. PETERSBURG - MAY 07: Pitcher J.A. Happ #48 of the Toronto Blue Jays is taken off the field after he was hit by a line drive from the Tampa Bay Rays during the game at Tropicana Field on May 7, 2013 in St. Petersburg, Florida. (Photo by J. Meric/Getty Images)

  • J.A. Happ

    Toronto Blue Jays starting pitcher J.A. Happ throws during the first inning of a baseball game against the Tampa Bay Rays Tuesday, May 7, 2013, in St. Petersburg, Fla. (AP Photo/Mike Carlson)

Happ was hit squarely on the left side of his head by Desmond Jennings' second-inning liner during Toronto's 6-4 victory over the Tampa Bay Rays. The left-hander was immobilized on a backboard, lifted onto a stretcher and wheeled off the field. He was taken to Bayfront Medical Center, where the Blue Jays said he was alert and undergoing tests.

Nursing supervisor Natasha Keller told The Associated Press that Happ had been admitted to the hospital and was in stable condition.

It was the latest injury to a pitcher struck by a batted ball in the last few years, and baseball has discussed ways to protect hurlers who ply their craft against the world's strongest hitters — only 60 feet, 6 inches from home plate.

General managers discussed the issue during their meetings in November and MLB presented several ideas at the winter meetings weeks later.

MLB staff have said a cap liner with Kevlar, the material used in body armour for the military, law enforcement and NFL players, is among the ideas under consideration.

The liners, weighing perhaps 5 ounces or less, would go under a pitcher's cap and help protect against line drives that often travel over 100 mph.

"We are actively meeting with a number of companies that are attempting to develop a product, and have reviewed test results for several products," MLB spokesman Pat Courtney told the AP in an email after Happ was injured. "Some of the products are promising. No company has yet developed a product that has satisfied the testing criteria."

Several pitchers around the majors sounded resistant — even after seeing replays of Happ's injury.

"You know the risks," Angels lefty C.J. Wilson said. "Guys get hurt crashing into fences. Guys get hurt tripping over first base and blowing their knee out. This is professional sports, and we are paid well to take those risks."

MLB could implement the safety change in the minor leagues, as it did a few seasons ago with augmented batting helmets, but would require the approval of the players' union to make big leaguers wear them.

Colorado Rockies left-hander Jorge De La Rosa said if a helmet or liner is developed for pitchers, he'd gladly wear one.

"It wouldn't be hard for me," De La Rosa said. "To protect against those kinds of things, it's good for us."

Cincinnati Reds pitcher Homer Bailey doesn't like the idea of wearing protective headgear.

"The game's been played a long time. Situations like that are unfortunate, but we have to keep it our game," he said. "I don't think you have to adjust the whole program."

And Seattle Mariners right-hander Aaron Harang thinks it would be difficult for veteran major league pitchers to adapt to new equipment.

"I know it's a hot topic," he said, "but I don't think it's a problem that's easily solved. I know a lot of people want pitchers to start wearing helmets. It's a good idea in theory, but I don't know how practical it is. I think you need to start with that at the lower level, I'm talking high school and maybe even lower, and then gradually introduce it into the higher level. I've been pitching since I was 6 years old and I've never worn a helmet. I think it would be tough to make that adjustment while pitching in a major league game."

Texas Rangers manager Ron Washington wondered if there's a viable solution.

"What can you do?" he said. "Tell hitters not to hit it back up the middle?"

Oakland right-hander Brandon McCarthy was hit in the head by a line drive last September, causing a skull fracture, an epidural hemorrhage and a brain contusion that required surgery. He was released from the hospital six days later.

McCarthy, who pitched for Arizona on Tuesday night against the Los Angeles Dodgers, said he won't watch video of Happ getting hit.

"I don't know what the GMs and the owners have to do with anything. It's not like they're pitching," McCarthy said. "Until someone makes something that works, it's going to be tough for someone to wear it.

"Most everything that's come out wouldn't have protected me, and it wouldn't have protected (Happ) if he got hit directly in the ear. You're at a point now where you're looking at batting helmets. You'd have to have something that protected the ear and then the face and beyond. So it's kind of a slippery slope. Someone will have to come up with something really good and really sound. Otherwise, I don't know how you answer that question."

Still, McCarthy maintains hope.

"We've put things on the moon before, so I feel like we can create some sort of a device that sits over your head and protects you," he said. "Someone will do it. It's just a matter of when, not if."

Jennings' liner caromed off Happ's head and halfway up the right-field line in foul territory as Jennings raced around the bases for a two-run triple. The 30-year-old Happ dropped face down at the front of the mound, holding his head with his glove and bare hand.

Team trainers, paramedics and medical officials rushed to Happ's aid as a stunned crowd of 10,273 at Tropicana Field fell into a horrified hush. A shaken Jennings stood with his hands on his head, and other players were visibly concerned as they watched Happ receive medical attention for about eight minutes.

The pitcher was wheeled off the field to a waiting ambulance. Just before he disappeared under the stands, Happ raised his right hand and waved. He received a standing ovation from the crowd, and the game resumed after an 11-minute delay.

"I came in and watched (video of) it and I wish I wouldn't have," Mariners pitcher Joe Saunders said. "It was ugly. It was scary. I just hope he's going to be all right."

___

AP Sports Writers Kristie Rieken in Houston, Arnie Stapleton in Denver and Joe Kay in Cincinnati, and AP freelancers Mark Didtler and Dick Scanlon in St. Petersburg, Fla., John Perrotto in Pittsburgh and Dave Boehler in Milwaukee contributed to this report.

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