Athletics right-hander Sonny Gray threw a 25-pitch bullpen session yesterday, during which he utilized all of his pitches and threw at a 100 percent effort level, writes Susan Slusser of the San Francisco Chronicle. He’s slated for another ’pen session on Friday — the next step in his rehab of a strained lat muscle that caused him to be shut down for most of Spring Training. Gray will throw one or two more bullpen sessions in total, then throw to live hitters once or twice before embarking on a rehab assignment (where he’ll likely make two minor league starts), per Slusser.