Tommy Freeman inspired Glasgow Rocks to a second scalp in as many weeks as they overcame BBL leaders Leicester Riders.
Freeman top scored with 24 points, less than 48 hours after learning his father was involved in a serious motorcycle accident in the United States.
Victory means the Rocks followed up last week's BBL Cup upset of London Lions with an 80-71 success, having made a slow start to the season.
There were also wins for Newcastle, Durham, Sheffield and Worcester.
|BBL Round Four results|
|Friday, 17 October|
|Leeds Force 79-83 Plymouth Raiders|
|Sheffield Sharks 96-80 Manchester Giants|
|Newcastle Eagles 98-72 Bristol Flyers|
|Worcester Wolves 82-68 Surrey United|
|Saturday, 18 October|
|Leicester Riders 88-87 Cheshire Phoenix|
|Bristol Flyers 61-72 Durham Wildcats|
|Sunday, 19 October|
|Plymouth Raiders 88-101 Durham Wildcats|
|Glasgow Rocks 80-71 Leicester Riders|
|Cheshire Phoenix 81-88 Newcastle Eagles|
|Manchester Giants 101-90 Surrey United|
"It was a must-win. Dropping two out of three league games to that point really put us behind the eight-ball," said Rocks forward Freeman.
"The game wasn't pretty. We made plays when we needed to and guys stepped up and made free throws and baskets in the fourth quarter when we needed them."
Riders are now tied at the top of the BBL Championship with Newcastle, who beat Bristol Flyers 98-72.
Right behind them are Worcester, after they improved to a 3-1 record with victory against Surrey United thanks to 23 points from ex-Surrey man Chavis Holmes, while Sheffield Sharks avenged their opening weekend defeat by Manchester Giants with a 96-80 success.
Plymouth Raiders beat Leeds Force 83-79 but fell to Durham Wildcats 101-88 on Sunday, after Wildcats had overcome Flyers 72-61 the night before.
Conner Washington was the star in Saturday's other game as he beat the buzzer to give Leicester Riders a dramatic 88-87 victory against Cheshire Phoenix.
Phoenix were then beaten 88-81 by Eagles on Sunday and Manchester Giants defeated Surrey United thanks to the accurate long-range shooting of Stefan Gill and Ingus Bankevics.
In the WBBL, Nottingham Wildcats edged Westfield Health Sheffield Hatters 77-76 in an early season battle of two Championship favourites.
Leicester Riders top the WBBL, following back-to-back success against Leeds Beckett University and Barking Abbey Crusaders.