Since he joined the Washington Nationals, Gio Gonzalez has been perhaps the most bubbly and affable presence in the clubhouse. The team's southpaw all-star wore his emotions openly, usually with a wide smile, and helped guide the Nationals to a division title with his career season. But Gonzalez, 27, has maintained a low profile since a report published Tuesday linked Gonzalez and others to an anti-aging clinic in Coral Gables, Fla., that is under investigation by Major League Baseball as an alleged supplier of performance-enhancing drugs. A frequent user of social media, Gonzalez has sent out only two tweets in five days, denying his connection to the clinic's owner and any performance-enhancing drugs. "I don't know, for whatever reason he doesn't choose to talk at the moment," said Abraham Ruiz, a close friend of Gonzalez since high school and his frequent barber in South Florida. "My job as a friend is to be there for him in this tough time. I'm sure, eventually, when the time is right, Gio will talk."