Marion scored 10 of his 24 points in the second quarter to help the Mavericks pull ahead 61-43 at halftime.
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O.J. Mayo had 13 points, 10 rebounds and nine assists for the Mavericks, who finished 4-4 in the preseason.
Byron Mullens, Charlotte's leading scorer in the preseason, had 16 points and 19 rebounds. Gerald Henderson scored 17 points for the Bobcats, who shot just 30 percent from the floor.
The Mavericks claimed Curry off waivers Thursday after San Antonio cut him and he was in the starting lineup a day after being picked up. The 7-footer had seven rebounds and was 4-of-8 shooting, including a nifty layup to finish a break early in the third.
Curry's addition comes at a time when Dallas' frontcourt is short-handed because of injuries.
Dallas forward Dirk Nowitzki, who played just one preseason game, had right knee surgery last Friday and could miss up to six weeks.
Center Chris Kaman missed his fourth in a row with a right calf strain and his status for Tuesday's regular-season opener against the Los Angeles Lakers is up in the air.
Forward Elton Brand was also rested Friday night by coach Rick Carlisle.