Sancho, 19, fed Spain forward Paco Alcacer for Dortmund’s opener just after the break before clinching the victory and his side’s first trophy since 2017 with a clinical finish within the final half an hour of play.
“We absolutely wanted to win this match, it was very difficult,” said Dortmund coach Lucien Favre.
“Bayern were very strong and had a lot of possession but we defended well and stayed very compact. We knew that we had to go on the counter-attack and we did that very well.”
Bayern, who pipped Favre’s side to the Bundesliga title last season and lifted the German Cup, were without World Cup-winning left-back and new signing Lucas Hernandez due to a knee problem.
Dortmund’s big name summer arrivals of winger Thorgen Hazard and Julian Brandt, as well as defender Mats Hummels, returning to the club after three seasons in Bavaria, were also ruled out due to injuries.
Bayern captain Manuel Neuer said errors proved costly. “We gave Dortmund the match by making too many mistakes,” Neuer said.
“We made the mistakes all on our own, we gave them possession and that’s why we conceded the goals.”
The home side, who finished second in the league last season, had a good early chance.
Portugal winger Raphael Guerreiro broke down the left flank and cut back to find captain Marco Reus inside the penalty box. Reus’s effort was well saved by Neuer after less than a minute of play.
Neuer was in the action once again after a quarter of an hour as he rushed out of his box to close down Alcacer 30 metres from goal. Alcacer beat Neuer to the ball but his shot dribbled past the goal.
Bayern’s best opportunity of the first half fell to Kingsley Coman 10 minutes later.
He found himself unmarked in the box but his toe-poked shot was saved by Marwin Hitz low to the right.
Bayern’s inability to make the most of the ball in first 45 minutes came back to bite them almost immediately after the break.
Sancho attacked down the left drawing four Bayern defenders with quick step-overs.
The teenager fed striker Alcacer at the edge of the box who beat Neuer with a low shot for a 1-0 lead on 48 minutes.
Dortmund’s lead was doubled with 22 minutes to go from a clinical counter-attack.
Sancho was free once again on the right wing, he burst into the box beyond Bayern’s back-four and nutmegged the experienced Neuer to make it 2-0.
Influential Sancho left the field with 10 minutes to play after seeming to be hurt following an off-the-field challenge by Joshua Kimmich.
Bayern coach Niko Kovac brought on Portugal midfielder Renato Sanches and France World Cup winner Benjamin Pavard late-on but they were unable to find the goals to retain the title and the early-season bragging rights.
Bayern start the defence of their league title by hosting Hertha Berlin on Friday August 16 and Dortmund play Augsburg a day later.
Chelsea teenager Ethan Ampadu’s loan to RB Leipzig is the latest in a number of moves British players have made to the Bundesliga.
PA looks at some of those and how they fared.
Reece Oxford, aged 20 (Borussia Monchengladbach, 2018/19 & Augsburg, 2019)
He may have become West Ham’s youngest player, making his debut aged 16 years and 198 days in July 2015 but his career has not progressed as he would have hoped. Two years later he went to Borussia Munchengladbach on loan but made just three appearances before his spell was cut short in December, only to return to the club a month later where he made a further four appearances. Another loan to the Bundesliga followed in January 2019 when he signed for struggling Augsburg, for whom he played just nine times after being sent off in February.
Oliver Burke, 22 (RB Leipzig, 2016/17)
Less than two years after making his debut for Nottingham Forest as a 17-year-old in 2014 Burke moved to RB Leipzig in a £13million move. He made 25 appearances as the team finished runners-up to Bayern Munich, although he started just five of those games. He returned to England with West Brom the following season before spending the second half of last season on loan at Celtic.
Jadon Sancho, 19 (Borussia Dortmund, 2017-present)
Omitted from Manchester City’s pre-season tour squad in the summer of 2017, Sancho signed for Dortmund for £8million and made his debut in October that year. He made 12 appearances in his first season but impressed enough to be given a new contract and was named Bundesliga player of the month in October 2019. He finished the season with 43 appearances, 13 goals and was named in the Bundesliga team of the season.
Ademola Lookman, 21 (RB Leipzig, 2018)
Then manager Sam Allardyce changed his mind in the January 2018 transfer window and allowed the winger to go out on loan but Lookman rejected a deal to Championship side Derby, insisting on a move to Germany. He came off the bench to score the winner on his debut, one of five goals in 11 appearances for the club, who tried to sign him permanently in the summer but were rebuffed.
Rabbi Matondo, 18 (Schalke, 2019-present)
After a handful of under-21 appearances for Manchester City in the Checkatrade Trophy over a couple of seasons, the Wales international moved to Schalke in a deal worth up to £11million in January 2019. He made two starts in nine appearances in the second half of the season.
Reiss Nelson, 19 (Hoffenheim, 2018-19)
The teenager made 16 appearances for Arsenal in his breakthrough season and signed a long-term contract with the Gunners before joining Hoffenheim on loan last summer. He scored seven goals in 29 appearances, most of which were as a substitute.
Ryan Kent, 22 (Freiburg, 2017)
After signing a new contract with Liverpool, Kent was loaned out to Freiburg but made just six appearances, with his only start against Bayern Munich at the Allianz Arena. The loan deal was cut short and he returned home to join Bristol City. Had a successful loan spell at Rangers last season.
Talented winger Yahya Al Ghassani’s lifelong ambition of playing football in Europe is edging closer to reality, but the Al Wahda star says he is adamant any potential switch will be just the beginning.
Contact has been with Arabian Gulf League outfit Wahda and negotiations are under way for a deal which would see Al Ghassani become the first UAE-born player to make a permanent move to one of Europe’s top-five leagues.
And although there is still plenty of work to be done to conclude a dream move abroad, the former Manchester United trialist is determined to finally make his mark in the big time.
“It’s always been my dream to play in Europe, but not just play in Europe, to make it big there,” Al Ghassani told Sport360.
“To play there is not hard, but to make it big is very hard.
“It’s a dream I’ve had since I was six-years old because I always wanted to play alongside Robinho, who was my favourite player growing up.
“When I was at Manchester United at 14, I knew it was possible. I was just playing football like any normal kid but when I was there, I knew it could be a reality for me to make it.
“From that moment, I’ve been working hard to make this come true.”
Working hard is the key quote because Al Ghassani has been logging hours on the training ground and in the gym since the conclusion of the 2018/19 AGL season in May.
The UAE Under-23 forward, who scored eight goals for club and country during an electric debut campaign, declined the opportunity for a vacation and instead has been grinding ahead of the Maroon’s AFC Asian Champions League round-of-16 clash with Saudi Professional League champions Al Nassr in August.
“Talent is not enough, that is why I sacrificed any vacation. I want to work hard, I have to get ready for the next season and football is all I think about so this is not difficult for me at all,” Al Ghassani added.
“I am still at the very beginning of my career. I have to sacrifice a lot and I have to work so incredibly hard because everyone knows talent is not enough in this game.
“Hard work will be the key to my success and that’s exactly what I’m trying to do.”
The UAE-born Tanzanian was singled out as one of the most promising young stars to look out for in the competition by the AFC and although injury punctured his opportunity to live up to that billing, his domestic form was impressive.
Al Ghassani says he is naturally delighted to be considered one of Asian football’s shining lights, but knows that tag comes with responsibility.
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First season for me was more than what I expected first trophy scoring on my debut being among best 10 youngsters in Asia.Sorry for the fans that we couldn’t achieve what they wanted we will fight stronger next season. Thanks for everyone who supported me and trusted me. Sorry if I haven’t met your expectations🤙🏽❤️
“It’s massive for me to be considered one of the most promising young players from Asia, but of course without Al Wahda I wouldn’t have been in this position,” he said.
“Any club I may join, and especially in Europe, they will expect me to hit the levels expected of someone with this reputation.
“Everyone knows there is talent in Asia and I have to show that it’s true.”
He added: “I am ready for this challenge, of course I have to be, because it is such a big step.
“But there’s still a lot which needs to be sorted because it depends on Al Wahda.
“They will decide my future, whether to accept or decline any offers, they have that right because I am contracted to them for another four years and I respect the club entirely.”
For now, Al Ghassani’s focus remains on Wahda as the team head off for a summer training camp in the Netherlands on Monday, taking in a friendly with 2009/10 Eredivisie winners FC Twente.
But as negotiations accelerate toward a dream move to Europe, the young forward was keen to thank his current club for guiding him to this point.“Al Wahda has given me such an unbelievable platform to showcase my skills,” he said.
“Before I came to Al Wahda, I had many trials all over the world but they were the ones who gave me a great opportunity.
“I owe them so much gratitude for everything they’ve done for me and I really cannot thank the owner Sheikh Diab bin Zayed Al Nahyan. As soon as I signed for Wahda, he came and spoke to me personally and motivated me so much.
“I’m grateful for his and the club’s guidance in helping my career so far.
“The atmosphere at the club has been brilliant. My debut season was fantastic.
“We won the Arabian Gulf Super Cup in my first game, I scored on my league debut and from there it has been amazing, more than what I could have expected.
“I hope everything goes well for this move, but if not I still have four more years with the club.”