Borussia Dortmund have weathered the frigid conditions to earn a 2-0 win away to Nurnberg and move into first place on the Bundesliga table.
After an entertaining but scoreless first half, Dortmund took no time to find their stride after the restart as Sebastian Kehl punctuated a fine passing sequence with the opening goal.
The game remained tight until the closing stages, but with eight minutes left to play, substitute Lucas Barrios doubled the visitors' advantage as he scored his first goal of the season, despite the mercury dropping to minus 10 degrees on a bitterly cold German night.
Hosts Nurnberg appeared well-prepared for the frosty conditions, and had the title holders pinned deep in their own half throughout the opening exchanges.
Tomas Pekhart had a penalty claim denied, and Dortmund twice failed to clear the ball from corner kicks.
In one such instance, Timmy Simons struck a glancing header towards goal, but Shinji Kagawa nodded clear.
Pekhart also found himself through on goal after 18 minutes, but Roman Weidenfeller did well to narrow his angle and make a save.
Shortly after, following another chaotic corner, the Czech striker struck a wild effort from close range that sailed over the bar.
Dortmund gained their composure and could have taken the lead on 21 minutes as Sebastian Kehl's through pass gave Robert Lewandowski a clear path to goal.
Raphael Schafer did extremely well, however, to deny the Polish striker.
Lewandowski would prove to be a continuous threat. On 26 minutes, he set up Kevin Grosskreutz who missed from close range, and after the half hour mark, had a superb effort from distance tipped over the bar.
Kagawa, who was at the heart of nearly every Dortmund attack, had arguably the best chance of the half, but could not properly connect as an open net awaited, and Schafer pounced to stop the slow-rolling ball from crossing the line.
Three minutes after the break, Moritz Leitner, who replaced the injured Sven Bender in the first half, played a meticulous through pass to Lukasz Piszczek, who cut the ball back for Kehl to stab home and make it 1-0.
With the temperature rapidly dropping, play in the second half was far less enthusiastic as that in the first 45 minutes.
The pace of the game slowed, and chances were a rarity.
Coach Dieter Hecking made aggressive substitutions for Nurnberg, bringing on Alexander Esswein and Albert Bunjaku as extra forwards, but neither had much impact.
Instead, it was Dortmund substitute Barrios who scored next. The Paraguay international was on hand to fire home the rebound from a Kagawa shot, sealing the three points.
The result sees Dortmund move first, three points clear of Bayern Munich and Schalke, who each have a game in hand.
Nurnberg remain 13th, but could be surpassed by Koln, Hertha Berlin and Kaiserslautern before the end of the round.