Agree with Go44... take the same approach you take when anticipating off-speed from a top pitcher. Stay back and think oppo. One of the biggest things is to not buy in to the dugout talk - "this guy is so slow", "this guy is meat, I can't believe I didn't crush him", etc. A big part of pitching effectively is disrupting hitter's timing. A "lesser" pitcher can be very effective in that regard. It is a challenge that must be overcome just as learning to hit guys that throw 88 with good secondary stuff.