Greene made only his second start on Sunday after being acquired in a trade with the Cardinals, but he went 2-for-5 with a double and a homer in his first start on Saturday, and scored a run as a pinch-runner on Friday.
"It's a great start, especially with a new team and new guys, and you want to fit in and feel like you can gain some trust that you can contribute to a win and move forward," Greene said. "[Saturday] was a great day for the team and a great day for myself."
Pearce, claimed off waivers two weeks ago, was hitting .382 with a .465 on-base percentage in his first 11 games with the Astros, including nine starts. He went 3-for-4 on Saturday to extend his career-best hitting streak to seven games.
"Their ability to run and take the extra base and their experience is great," Astros manager Brad Mills said.