Justin Upton aiming to strengthen shoulder this winter

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Diamondbacks outfielder Justin Upton played in only four games during the month of September and just one game in October because of soreness in the area of his left shoulder.  He has promised to work on the strength and conditioning of that shoulder this offseason and got a head start this afternoon at Arizona’s Chase Field.

Jack Magruder of FOX Sports Arizona reports that Upton felt no pain or discomfort while batting in an instructional league game on Thursday, the same game that Brandon Webb appeared in for two innings.  Webb allowed three hits and two runs, again showing poor velocity on his sinking fastball.

Upton, 23, had a massively successful 2009 campaign, batting .300/.366/.532 with 26 home runs, 86 RBI and 20 stolen bases over 526 at-bats.  That all led to some wildly optimistic projections for 2010 and Upton simply didn’t live up to the hype.

He’s still plenty young and immensely talented, and a healthy shoulder should only aid in his ability to get back on track.  He should at 100 percent by the start of spring training in 2011.

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.