Parsons went 12-of-13 from the field overall and got 11 of his total in the big quarter, which saw the Rockets drain six 3-pointers.
James Harden struck for 14 of his 21 points during the frame -- which matched the third-highest quarter total in the NBA this season.
O.J. Mayo led Dallas with 18 points as the Mavericks fell for the fourth time in five games.
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