A dramatic weekend saw eight teams turn into four in the battle to reach The O2.
Bristol Flyers put a 17-game losing streak against Esh Group Eagles Newcastle behind them to record a memorable 77-60 triumph in their home tie, which was enough to overturn the 97-86 loss they suffered on Friday night.
Jordan Davis starred with 17 points, 9 rebounds and 9 assists and hit a huge three late on to ensure the Flyers reached the Semi-Finals of the Play-Offs for the first time.
“We talked about our winning record and a top-6 finish, but to progress to the semi-finals and beat a team like Newcastle, it’s a historic moment for the club,” declared Kapoulas.
“We produced one of our best defensive performances of the season - keeping a team like Newcastle to just 60 points.
“It was a complete team effort and I’m proud of all the players and coaching staff - we will enjoy this moment."
Glasgow Rocks also bounced back from a First Leg defeat as they produced a dominant display to beat Surrey Scorchers 99-75 behind 23 points and 14 rebounds from Earl Brown.
The Scorchers had extended their winning run at home to 11 straight on Friday as they edged a tight contest 84-82 with a 30-point haul from Tony Hicks, but they came up short on their trip to Scotland.
"It feels amazing [to get the win] and I'm ready to do it all again next week," declared Brown following his side's victory.
"We talked about playing hard and as a team for 40 minutes straight.
"We have to focus on the things that we do well and enjoy playing together as a team."
London Lions needed two periods of overtime in the Second Leg to get the better of Worcester Wolves as their eventual 94-90 success set up a 179-174 aggregate victory.
The Lions had edged the First Leg on the road, 84-85, but were within seconds of elimination before captain Joe Ikhinmwin hit a huge three to force overtime with the score 77-78 at the end of regulation - and they eventually prevailed.
Also, Leicester Riders advanced to the last four once again as they backed up a 73-86 success away at DBL Sharks Sheffield with a 79-67 home victory 24 hours later with Pierre Hampton scoring a combined 40 points in the tie.