“He was a little worried,” Castro said. “He’d been doing good, all of a sudden he’s having a little bit of a hard time. I don’t think it’s bad, but one of the things I told him was ‘you cannot be doing the same thing over and over when the guys kind of start knowing you more.’ ” Baez has a 99-mph fastball that he throws about 60 percent of the time. That frequency isn’t a problem in and of itself, but Castro felt Baez could be using it more effectively.“If he’s like the guy who throws fastballs as his main pitch, he needs to have another repertoire to make the pitch work,” Castro said. “That’s what we talked about. I’ve never been a pitcher. I’m seeing it from a hitter’s perspective. You can go in, out, up, down, but your sequence has to be different with different hitters to set his main pitch up.”In his first relief appearance since their chat, Baez threw two-thirds of an inning Monday in Cincinnati. He threw 26 pitches; 21 were fastballs and only 14 were strikes. The Reds scored twice, stringing together a single, a triple and a sacrifice fly.Whether or not Castro’s advice does the trick will only be answered in time. Baez might have some leeway there. He’s middle-aged for a baseball player at 28 years old, but only four of those years have been spent pitching. Newsroom GuidelinesNews TipsContact UsReport an Error LOS ANGELES >> When Juan Castro served as a roving assistant in the Dodgers’ front office, Pedro Baez was a young third baseman cutting his chops in the low minor leagues.As he canvassed the Dodgers’ farm system, Castro would occasionally cross paths with Baez. Both men spoke Spanish and played the same position, so Baez was the perfect pupil for a retired infielder making his maiden voyage into a post-playing career. Castro and Baez have known each other for four years now, longer than most in an ever-changing clubhouse.While Baez has carved out a steady job in the bullpen, Castro is the Dodgers’ quality assurance coach. He’s in uniform before each game. During the game he sits and watches from the stands, usually behind home plate.Occasionally Castro will notice something a coach in the dugout won’t. Such was the case over the weekend in Cincinnati, when Baez sought to pick Castro’s brain after a stretch of poor outings. Baez has allowed nine earned runs in nine August innings. “He’s still kind of young as a pitcher,” Castro said. “He’s still learning and understanding the frustration.”Injury updatesAndre Ethier was back with his teammates at Dodger Stadium, but he declined to give a prognosis as he nears a minor league rehab assignment for his fractured right tibia. Manager Dave Roberts said that the club was still discussing internally when and where Ethier would play his first game.Brandon McCarthy also declined to offer a prognosis after throwing a bullpen session. The right-hander is on the 15-day disabled list with right hip stiffness.Alex Wood threw from flat ground up to 90 feet and “is getting close” to throwing a bullpen session, Roberts said. The left-hander remains on track to join the Dodgers as a reliever in September, with a simulated game — not a minor league rehab assignment — next on his checklist.Brett Anderson said he will try to test a blister on his left index finger by throwing breaking pitches from flat ground Thursday. The left-hander said the blister affects him only when throwing sliders and curveballs.Anderson and McCarthy are both possibilities to start a minor league rehab game, Roberts said.AlsoRoberts confirmed that Ross Stripling will start Thursday against the San Francisco Giants and Bud Norris will start Friday’s series opener against the Chicago Cubs. … Saturday and Sunday’s starting assignments remain to be determined. … Hyun-Jin Ryu will begin a throwing program in the next couple days, Roberts said. The manager said that Ryu “doesn’t want to write the season off. He wants to continue to rehab, get healthy and see where it takes him. We’re not really putting any expectations on it.” … Infielder/outfielder Rob Segedin will be activated from the paternity list Thursday, Roberts said. He and his wife Robin welcomed the couple’s first child late Tuesday, a son named Robinson Marley Segedin.