By Matt Hladik The Pittsburgh Steelers won yesterday’s season opener, but lost star outside linebacker T.J. Watt to injury in the process. We know for certain that Watt tore his pectoral muscle. What we don’t know yet is if the tear is serious enough to require surgery. According to ESPN’s Adam Schefter, Watt will seek out “second and third” medical opinions on his injury tomorrow. Depending on what those opinions are, he could be out until midseason or be done for the year. “If doctors determine that Watt needs surgery, his season likely would be over; if he doesn’t need surgery, he could pos…