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 [...]