Cincinnati right fielder Austin Kearns had a strong rookie year with a slugging average of .500, but he still makes rookie pay.

FORBES: The Over/Under All Stars

He had only 61 at bats last season, but finished the year with a .328 average and slugging percentage of .590.

FORBES: Yankees Bolster Rotation With Kuroda And Pineda

Jeter just wrapped up the worst regular season of his illustrious career with career worst marks for average, on-base, slugging and home runs.

FORBES: Can Derek Jeter Turn Back The Clock?

Hitters were measured by six major offensive categories: batting average, on-base percentage, slugging percentage, home runs, runs batted in and extra base hits (homers and extra base hits, since they're largely absorbed by slugging percentage, were given less weight).

FORBES: Ten Worthy Of Cooperstown

Leading the bunch is Minnesota's Justin Morneau, whose .342 batting average, 18 homers and 1.056 on-base plus slugging percentage (OPS) makes him baseball's most productive player during the first half of 2010.

FORBES

From the old school (home runs, batting average, runs batted in, wins, earned run average) to the money ball school (on-base percentage, slugging percentage, wins over replacement player), there's more to feed the stat geek's appetite than ever.

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Baseball rules state a player needs to average 3.1 plate appearances for each of his team's games to become a batting, slugging or on-base percentage champion.

WSJ: MLB: Melky Cabrera Disqualified From National League Batting Title

Rodriguez will turn 37 in July, yet his on-base plus slugging totals have declined for five straight years, from an otherworldly 1.067 in 2007 to an above-average .823 last season.

WSJ: A-Rod's Bat Awakens in the Bronx