I dunno. The three extreme Spring Training performances that come to mind from recent memory are Uggla’s bad spring, McLouth’s bad spring, and Heyward’s good spring. They went on to have bad, bad, and good opening months of those seasons, respectively, matching their spring outputs pretty faithfully.
But that could be selective memory. In fact, I’m not even sure I’m right about those ones.
There’s how many spring training games? 29 or 30? I’m not saying that these haven’t been two REALLY dismal performances, but they could be a distant memory very shortly with some, you know, not demoralizing performances.