Tuesday's triumph avenged their 78-55 defeat at Bonn on November 26 and improved Keravnos' record to 1-3 while dropping Telekom Baskets to 2-2.
Keravnos seized the initiative late in the first quarter.
Bradley Buckman's lay-up with 2:17 to go in the opening frame tied the contest at 16-16 and Barisa Krasic followed with a three-pointer.
Krasic then split a pair of free throws before Patrick Flomo's lay-up made cut the lead to 20-18 with 10 minutes played.
LaMarr Greer scored on a drive and Buckman followed with a lay-up and three-point play and another lay-up for a 29-18 Keravnos advantage.
The lead grew to 38-23 inside the final minute of the quarter after a Greer three-pointer.
Telekom Baskets went to half-time behind 55-40 and Keravnos effectively delivered the knockout by scoring the first six points of the third quarter.
Panagiotis Trisokkas scored 16 points, Krasic 15, Greer 13 and Buckman 11 for Keravnos.
For the German outfit, Ken Johnson scored a game-high 21 points.
Keravnos were 17 of 25 at the line compared to Bonn's 10 of 12.