The Packers wasted no time in getting on the scoreboard after two consecutive big plays from Eddie Lacy set up a field goal. Crosby made no mistake with the 45-yard attempt to give the visitors an early lead.
From that point on the defense was on top for both sides, with Green Bay quarterback Aaron Rodgers being sacked three times, fumbling on two of those occasions.
Joe Flacco was also caught three times in a half where both quarterbacks struggled to get going and had poor pass completion rates, although there were no interceptions for either side.
Crosby did have a rare chance to extend his side's lead late in the second quarter, but he sliced his initial field goal wide.
He was given a second opportunity following a fumble by Flacco, however, and this time he slotted the kick through the posts from 31 yards to make it 6-0 going into the break.