Sebastian Kehl scored a sensational long-range goal against his former club as Borussia Dortmund beat Freiburg 1-0 on Sunday.
The Dortmund captain struck in style just before the hour mark to move Jurgen Klopp's side four points clear of third-placed Bayer Leverkusen, who could only draw at Hannover on Saturday.
Kehl instinctively shot after Kevin Grosskreutz fed the ball into his path, with the 25-yard effort curling over Freiburg goalkeeper Oliver Baumann and into the back of the net.
The midfielder's first goal in any competition since April 2012 secured the three points for Dortmund, but they were made to work hard by the relegation-threatened hosts.
Christian Streich's side felt Dortmund defender Sokratis Papastathopoulos should have been sent off for bringing down the impressive Philipp Zulechner on the stroke of half-time.
And Freiburg were made to rue their luck, too, as they remained in the bottom two of the Bundesliga.
Hampered by the absence of Robert Lewandowski (knee) and Marco Reus (foot), Dortmund started slowly, with a weak Nuri Sahin free-kick all they could muster in the early stages.
Pierre-Emerick Aubameyang fired wide after a neat team move but Freiburg were well organised at the back, frustrating their opponents, who had won the last seven meetings between the two sides.
Zulechner, making his first Freiburg start since arriving from Austrian side Grodig last month, shot over after a corner was not properly cleared, but the home fans were the liveliest aspect of a tame first 30 minutes.
Mats Hummels' well-weighted long ball could have caused Freiburg problems but Baumann was quick to react before the first half's major talking point angered the hosts.
Zulechner, who was sent through on goal, was hauled down by Sokratis in the 43rd minute, but the Greece defender – who was the last man – was only given a yellow card.
Dortmund capitalised on their good fortune with a promising start to the second half as Julian Schieber, deputising for top scorer Lewandowski up front, shot into the side netting.
Schieber then agonisingly missed a teasing ball across the face of goal from Henrikh Mkhitaryan in the 54th minute but the visitors soon had the lead, with Kehl's piece of brilliance leaving Baumann with no chance.
Freiburg battled for an equaliser and regularly got into good positions, with Ahmed Mehmedi a constant threat.
Dortmund nearly scored again, with substitute Jonas Hofmann blazing over from close range after Aubameyang's cut-back in the dying stages, but one goal was enough as Klopp's charges continued their excellent record against Freiburg.
|Coach: C. Streich|
for V. Darida 66'
for P. Zulechner 70'
for J. Schuster 76'
|James backs Southgate for full-time England job|
|Ancelotti unconcerned by Lewandowski, Muller droughts|
|Bilic frustrated by crowd trouble as London Stadium ´felt like home´|
|Luis Enrique defends Barcelona in LaLiga disciplinary row|
|Premier League title fight will go to the wire - Cech|
|Simeone ignoring Premier League rumours|
|Klopp: I like Ferguson, is that allowed?|
|Begovic claims Chelsea did not rub in Mourinho win|
|´Genius´ Ronaldo is not anxious - Zidane|
|Allegri defends Higuain´s form ahead of Napoli return|
|Wenger hopes West Ham act to avoid stadium ban|
|Bilic credits players for West Ham´s revival|
|Pardew urges concentration to combat in-form Liverpool|
|Howe wants Cherries´ away form to blossom|
|Scholl slams Golden Boy Sanches|
|Pulis signs contract extension at West Brom|
|Ballon d´Oh! Wenger highlights disdain for award with Ozil gaffe|
|Liverpool must be ´angry´ to beat teams at the bottom - Can|
|Perez blow for Arsenal with striker facing eight weeks out|
|Neymar the victim of a media campaign - Rafinha|
|Cannavaro dreams of Real Madrid job|
|Alonso lauds Klopp for embracing Liverpool culture|
|Barcelona report LaLiga chief Tebas to sports court|
|MLS Review: Late goal from Valdez sees Sounders through, Impact rout DC|
|Saul committed to Simeone and Atletico|
|Ronaldo deserves to win Ballon d´Or - Cannavaro|
|Shaw eager to earn Mourinho´s trust at United|
|Neymar playing for Barca because of Messi, says father|
|Jardim questions Falcao´s stints at United and Chelsea|
|Berardi will get Italy call when system changes - Ventura|
|Lucas Vazquez delighted by ´dream´ Madrid deal|
|Scottish FA chief backs cross-border competition|
|Dortmund need Reus - Aubameyang|
|Lamela eyeing new Spurs deal|
|Tighter Watford matches are a coincidence, says Mazzarri|
|Karanka: We saved Boro from League One|
|Police investigate homophobic leaflet at West Ham|
|Spain could recall Villa, reveals Lopetegui|
|Hughes backs Bony to break Stoke duck|
|Sarri will greet Higuain ´like a son who made him angry´|
|Robben receives Netherlands recall|
|Dyche considering Gray recall for Burnley|
|Zidane was behind one of my best seasons, says Ronaldo|
|Schweinsteiger absent from United squad photo|
|Emery emphasises Thiago Silva´s importance amid Juve links|
|Ferguson: Leicester will make deep Champions League run|
|Ranieri hails ´special´ Ballon d´Or nominations for Vardy and Mahrez|
|Emery: PSG cannot rely solely on Cavani goals|
|Mourinho can match Guardiola, insists Ferguson|
|Ferguson hails Klopp: Liverpool are strong title contenders now|
|Bayern optimistic over Lewandowski renewal|
|Zubizarreta appointment confirmed by Marseille|
|Clichy: Things will click into place for Manchester City|
|Chiellini: Juventus wanted to send a message|
|Gabigol´s time will come - De Boer|
|Ronaldo: Messi and I are not friends - but we respect each other|
|Earthquake halts play in Serie A game between Pescara and Atalanta|
|Mourinho charged over Taylor comments|
|Ronaldo: I need my haters|
|Badstuber hopeful injury woes behind him|
|Kroos did not want to be rested, insists Zidane|
|Rojo was phenomenal - Mourinho|
|Seven arrests made after West Ham - Chelsea fan clashes|
|Florenzi injury blow for Roma|
|MLS Review: Galaxy, Toronto into semis|
|Beister: Victory move surprised people|
|Bilic: Cup run will help in Premier League|
|Pjaca out for up to three weeks|
|Trophies still the focus for Guardiola|
|Mignolet wants ´fair´ Karius battle|
|Ancelotti impressed by motivated Bayern|
|West Ham ´unreservedly condemn´ crowd trouble|
|Allegri praises strike duo after win over Sampdoria|
|De Boer praises two-goal Icardi after vital win|
|Chelsea were ´unlucky´ with missed chances, insists Conte|
|Mourinho: I´ve never had fans like these|
|Nacho´s goal better than my Champions League final volley - Zidane|
|Borussia Dortmund 1 Union Berlin 1 (aet, 3-0 pens): Weidenfeller shootout heroics seal progress|
|Bilic: Crowd trouble distracts from great West Ham win|
|Kompany told me he couldn´t play anymore - Guardiola|
|Liverpool and Manchester United handed home quarter-finals|
|Inter 2 Torino 1: Icardi double alleviates pressure on De Boer|
|Manchester United 1 Manchester City 0: Mata extends Guardiola´s winless run|
|West Ham 2 Chelsea 1: Crowd trouble tarnishes Hammers´ route to quarter-finals|
|Cultural Leonesa 1 Real Madrid 7: Morata and Asensio star in BBC´s absence|
|Bayern Munich 3 Augsburg 1: Green´s first goal sends holders through|
|Juventus 4 Sampdoria 1: Rapid start sets champions on their way|
|Crafty Suarez is world´s best striker - Godin|
|Mancini: Balotelli has wasted years but can bounce back|
|Rami rejected ´risky´ PSG move|
|Neymar would have cost PSG €430m, claims father|
|Sacchi warns Bayern players over Ancelotti temper|
|Valencia ´pleased´ with RFEF bottle ruling|
|Mourinho apologises to Utd fans for Chelsea thrashing|
|Barcelona lash out at ´totally reprehensible´ RFEF comments|
|Jacob leaves Marseille amid rumours of Zubizarreta appointment|
|Lavezzi added to Argentina squad as Dybala drops out|
|Del Bosque: Mourinho had a point on Conte|
|N´Zonzi in talks over Sevilla extension|
|Allardyce successor ´will not be a mercenary´ - Glenn|
|Aubameyang like a rocket, Lewandowski perfect - Riedle|
|RFEF fines Valencia, warns Barca over bottle incident|
|Wenger tells Iwobi to improve his finishing|
|Barcelona without Mathieu for three weeks|
|Kimmich draws inspiration from Xavi|
|Vazquez signs new Madrid deal|
|Higuain the best striker in the world - Nedved|
|Wolfsburg regret De Bruyne, Perisic sales|
|Parejo slams Neymar for ´inciting´ Valencia fans|
|Gundogan predicts ´very lively´ Manchester derby|
|Luis Enrique satisfied with Supercopa workout|
|Messi could join Newell´s after World Cup - Maxi Rodriguez|
|Ibrahimovic wants United to be the boss of City|
|Schmidt on the bus as Lotte book ticket for next round|
|Pogba still adapting to Premier League, says Mourinho|
|Southgate hails influence of demoted Rooney|
|Lille ready to heap more pressure on PSG as Corchia dreams big|
|I´m among top 20 LaLiga coaches, jokes Luis Enrique|
|Brattan earns Socceroos call-up|
|Pochettino pleased with Janssen|
|Klopp never questioned Sturridge quality|
|Barcelona downed by Espanyol in Supercopa|
|Heavy Milan defeat ´just a bump in the road´ - Montella|
|Pochettino wanted Liverpool debutant sent off|
|Klopp happy to entertain as Liverpool youngsters earn their spurs|
|Leverkusen dumped out by 10-man minnows|