The Giants made a late push but it wasn’t enough to snatch a win in Glasgow.
David Aliu kept his scoring streak going with 29 points and Rob Marsden battled for 16 points and 13 rebounds.
But the Giants could not seal a second away win of the season.
The Rocks took the first quarter 28-22 and led 49-39 at half-time.
Jeff Jones’ men halted the Rocks’ progress in the third and in the fourth came close to overhauling their hosts.
They got to within four points but could not grab victory.
The two teams clash again on Sunday at Wright Robinson with the Giants determined to claim a place in the semi-finals of the BBL Trophy.