Astros hitters will get their first look at live pitching during workouts Sunday, when the pitchers will throw to batters with a screen in front of the mound. There will be four days of live batting practice before the manager Bo Porter will hold an intra-squad game on Thursday.

“I just want the pitchers to make it through safe,” Porter said. “That’s more pitching practice than live batting practice. Whenever you incorporate screens and the backstops, that’s always been tough on the position players. It’s more about the pitchers than anything else. It does all those guys good to see a live arm and pick up the velocity on the baseball.”

The team will meet with the Major League Baseball Players’ Association on Friday and hold a like workout in advance of Saturday’s Grapefruit League opener against the Phillies in Clearwater, Fla. Porter said the real evaluating of the players won’t begin for a while.

“Right now I’m honing on guys’ workouts,” he said. “When you get to the beginning stages of Spring Training and you don’t have the competition aspect of another team, you want to watch guys and see how they work. You watch them from a fundamental standpoint and see if anyone needs extra, extra, extra work as far as a particular fundamental.”

Porter stressed fundamentals to his club again Saturday, saying that in the American League teams don’t usually bunt until they’re behind late in the game. He said it’s vital teams field those bunts successfully to get outs to increase their chances of winning.

“You increase your chances of winning the game when you execute these plays properly,” he said. “It puts an emphasis on it, and the players actually understand the significance.”

• In case you missed it, Astros owner Jim Crane told MLB.com he was looking forward to playing golf with President Barack Obama on Sunday. Obama is spending the weekend at Crane’s Floridian National Golf Club. MLB.com has the details.

Here are the pictures of the first full-squad workout:

Justin Maxwell poses for a baseball card photo.

Nate Freiman signs for fans.

Chris Carter poses for a baseball card photo.

Chris Carter and Carlos Pena talk at the cage.

Carlos Pena takes BP.

Hitting coach John Mallee talks to J.D. Martinez at cage.

Lucas Harrell looks for someone to high five.

Astros players with post-workout high five.

Former Astros MVP Richard Hidalgo, who lives in the area, watches the workout.

Pitcher Sam Demel throws to first base.

Third base coach Dave Trembley gives directions.

Morgan Ensberg, infield coach for Class A Lancaster, hits grounders.

Former Astros SS Adam Everett, an infield instructor, hits grounders.

Bud Norris.

Bo Porter talks to the media.

Jim Crane talks to the media.

Jim Crane’s helicopter takes off.