Reliever Wesley Wright quickly pulled the picture down while Martinez was away. Martinez said Wright is one of many Astros players who were rooting against the Heat.
"This has been going on all year," Martinez said. "Everyone hating on the Heat. Being from Miami, I have to stand up for them, so I've been sticking up. Now it's my day where I get to talk trash a little bit."
He said he watched Game 5 against the Oklahoma City Thunder at Jed Lowrie's house with a couple of other teammates.
"They laugh at how into I get," Martinez said. "Part of being a fan."