The Canadian teenager was one of Bayern's standout players as the club beat Borussia Dortmund 1-0 to close in on another Bundesliga title, with his marauding runs a key part of the visiting team's attack and defence.
He likely prevented a goal when he raced back to deny Norway star Erling Haaland a scoring chance and almost created one of his own when he eluded four Dortmund players before being bundled over by Mats Hummels.
On his fastest run, the left-back was clocked at a top speed of 35.3 kph (21.9 mph).
"Alphonso is a player with a lot of heart and a lot of power, with extreme power," Bayern forward Thomas Muller said. "Sometimes maybe he is not in the best position on the field, but he gets the opponent thinking, 'Oh, I have time, I have time,' and then, 'Meep, meep! Meep, meep!' The Road Runner, the FC Bayern Road Runner, comes and steals the ball."
Bayern said Davies made 42 sprints in all. He was involved in plenty of challenges, too, and was harshly booked late on for bringing down U.S. teenager Gio Reyna outside the penalty area when TV replays showed he got the ball.
Davies, who started the season with Bayern's reserves, has now started every game in the Bundesliga, German Cup and Champions League for the senior team since Union Berlin visited in the league on Oct. 28.
His emergence is bad news for Bayern's record signing Lucas Hernandez. The France World Cup winner, who joined from Atletico Madrid last summer for €80 million ($90.5 million at the time), has had to be content with substitute appearances. Hernandez came on in only the 85th minute against Dortmund.
Davies' story was already a remarkable one. His parents, Victoria and Debeah, fled civil war in Monrovia, the capital city of Liberia in western Africa, for Buduburam, a refugee camp west of Accra in Ghana. Alphonso was born there, and the family lived there until he was 5 years old before moving to Canada in 2006.
The family settled in Edmonton, Alberta, where Davies began playing football, first at school, then at a free after-school league for inner-city children.
He joined the Whitecaps' residency program when he was 14. He went on to become the youngest player to appear in the United Soccer League and became the first player born this century to play in the MLS, aged 15 years, 8 months and 15 days.
"He offers a lot of promise for the future," Bayern sporting director Hasan Salihamidzic said when the deal to bring Davies to Bayern was announced in July 2018.