Depends on the stat you are talking about, but generally speaking never. A single season isn't really enough to discuss a baseball player and compare him to other baseball players. To use an example, I would have had a problem with someone saying Bautista is the best power hitter in baseball after last year. It looks like he is repeating it this year and that second year of doing it makes the argument carry some actual weight, but way too many guys have some goofy spike year (like Bill Hall) and it turns out to be just a fluke. You want to say someone is having a good year or whatever that is fine, but when you try to argue about how good a player actually is, you need more than a 26 game sample. The problem is that you apparently have a light bulb mind without a dimmer switch. On or off, with nothing in between. Either statistics have meaning because the sample size is large enough OR the statistics have no meaning because the sample size is too small. That's just not true. The fact of the matter is that all data means SOMETHING no matter how large or how small the sample is. The smaller the sample, the less meaning, the larger the sample the more meaning. The more recent, the more meaning as well. I've yet to see anybody talk about how great Yuni is because of the last month. Pretty much all the "positive" things that have been said are just as you described. He had an atrocious first week of the season, and he has been quite good since then. That's basically the extent of the positive comments around here. However, his detractors refuse to admit that he's been good for the last 3 weeks. This makes no sense.