No, I'm pretty sure it was a one time thing because the Dodgers had used up everybody on the bench already. I doubt he plays 3B again.
Looks like this is wrong.
From CBS Sportsline.
The L.A. Daily News reports that manager Joe Torre said one way to get Russell Martin a break from behind the plate, but still keep his bat in the lineup, is to give him starts at third base. Martin made his major league debut at third late in Friday's game. "When I was catching, they gave me my day off at first," Torre said. "The thing about catching, not only is it the physical part but the mental if you do your job right."
Analysis: Martin was actually drafted as a third baseman, but was switched to catcher by the Dodgers. "It's not like I was a catcher playing third, I was a third baseman who played catcher," Martin said. "It's not like it was that difficult to make the transition. I take ground balls every day so it's not like I lost the feel taking ground balls." He is a must-start in all Fantasy formats, despite what position in the field he is playing. Considering he's the only player at his position with 20-20 potential, you should start him in all formats. He now has a five-game hitting streak.
That great wooshing sound you hear is Martin's value going up.