Marlins rookie Mike Stanton showing historic power at age 20

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Mike Stanton went deep twice yesterday, giving the Marlins rookie 20 homers in 81 games (or exactly half a season) as a major leaguer. He also homered 21 times at Double-A before being called up in June, so Stanton has 41 long balls in 134 total games this season. Not bad for a 20-year-old.
In fact, very few 20-year-olds in baseball history have shown this much pop. Isolated Power is a stat that subtracts batting average from slugging percentage to show someone’s power removed from everything else, and right now Stanton is at .278.
Here are the all-time leaders among 20-year-olds with at least 300 plate appearances:

                    YEAR     ISOP
Mel Ott             1929     .306
Ted Williams        1939     .281
MIKE STANTON        2010     .278
Alex Rodriguez      1996     .273
Bob Horner          1978     .272
Frank Robinson      1956     .267
Tony Conigliaro     1965     .244
Jimmie Foxx         1928     .220
Mickey Mantle       1952     .219

Stanton is hitting just .251 with a .318 on-base percentage and has struck out 100 times in 81 games, so he certainly has some sizable flaws, but that’s one hell of a list to be on after making the jump from Double-A as a 20-year-old rookie.

Report: Momentum in talks between Mariners, Jon Jay

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MLB.com’s Mark Feinsand reports that there is some momentum in talks between the Mariners and free agent outfielder Jon Jay.

Jay, 32, hit .296/.374/.375 in 433 plate appearances with the Cubs last season, which is adequate. He’s heralded more for his defense and his ability to play all three outfield spots.

The Mariners are losing center fielder Jarrod Dyson to free agency and likely don’t want to rely on Guillermo Heredia next season, hence the interest in Jay. The free agent class for center fielders is otherwise relatively weak.