49ers Stock Watch: Who's Up & Down Midway through Preseason?

49ers Stock Watch: Who’s Up and Down Midway through the 2016 Preseason?

Aug 20, 2016; Denver, CO, USA; San Francisco 49ers tight end Vance McDonald (89) congratulates running back Carlos Hyde (28) after his touchdown in the second quarter against the Denver Broncos at Sports Authority Field at Mile High. Mandatory Credit: Isaiah J. Downing-USA TODAY Sports /

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December 20, 2014; Santa Clara, CA, USA; San Francisco 49ers center Marcus Martin (66) blocks defensive end Corey Liuget (94) during the fourth quarter at Levi’s Stadium. The Chargers defeated the 49ers 38-35. Mandatory Credit: Kyle Terada-USA TODAY Sports /

Stock Down — Center Marcus Martin

49ers fans would rather forget third-year pro Marcus Martin’s efforts from 2015, and the former USC product is certainly on the bubble entering this season.

With center Daniel Kilgore slated for the first-team unit, Martin has been relegated to backup duties. And he may not even get the job here.

Just take a look at Martin (No. 66) being pushed clear out of the way on this clip from Brandon Thorn of IT Pylon:

Martin isn’t making the stride from his first two years at the NFL level, and he certainly appears to be on the weak side of the roster bubble.

And, according to Cam Inman of the San Jose Mercury News, the 49ers are experimenting with veteran guard Zane Beadles at the center position — a move which could spell the end for Martin’s tenure in San Francisco.

Zane Beadles, #49ers starting left guard up to now, snapped ball in warmups with Kilgore for first time. Good idea if Marcus Martin gets cut
— Cam Inman (@CamInman) August 22, 2016

Next: Stock Up: Marcus Rush