Expect that they don't. Joe Mauer 2014 bases empty: .697 OPS. Joe Mauer 2014 RISP: .796 OPS. Yes, a lot of that is OBP driven (his OBP is a whopping .400 with RISP) but his slugging is also marginally higher with RISP (.015). What can we learn from this? That RISP is pretty much a useless statistic on which to base a player's worth, as it fluctuates wildly from season to season due to SSS. Joe Mauer spent the bulk of his career hitting marginally better with RISP, just as most players do (because RISP appearances tend to come against worse pitchers who are hit more easily). He didn't suddenly "forget" how to hit with RISP after a decade in the league. It's a meaningless statistic. Joe Mauer has been a pretty bad hitter this season. That's his problem, not RISP.