Astros left fielder J.D. Martinez had a bittersweet Friday night, hitting a two-run home run in the second inning before exiting in the fourth with a sprained right knee. “I was just bummed out more that I couldn’t finish the game really,” he said. “I was feeling good and I knew it was going to be a good game.” Martinez’s right knee buckled under him when he checked his swing in the fourth inning. “I just swung, a checked swing and then I kind of was just telling my knee to stop and avoid the pitch because it was coming in,” he said. “I guess it was too many signals to one area. I didn’t know what to do. “Like I said to the trainers, it happened to me in college before. I was using metal cleats then and I had to switch to molded. Ever since I switched to molded it never happened again. This is the first time it happened since my freshman year in college. That’s why I’m confident I’ll be all right. I know it’s going to take a couple of days to calm down.” Martinez, who will wear a knee brace like he did after suffering the injury twice as a freshman in college, is listed as day-to-day. “The first time it took me three weeks (to recover), and the second time it took me like a week,” he said. “Even now walking around it’s just sore, but it’s nothing like you can’t put any weight on it.” Lucas Harrell (1-2) said the frustration he showed after he was pulled was not aimed at manager Bo Porter. “I was struggling to throw strikes again,” he said after earning his first victory of the season. “It’s just kind of been a trend right now. It’s something I need to work on between starts and definitely focus on that.