How can this be?

The two most important batting stats are on-base percentage and slugging percentage. Travis Hafner has ranked among the best in baseball in each of these stats for the last 3 years. As of now, he ranks first in the majors in OBP and first in the American League in slugging this season.

The best hitter in the league this season and he's been doing it consistently for several years, but he's not an all-star!