Vodacom Bulls coach Johan Ackermann says the bounce of the ball and the 50-50 calls went against his side in a 13-8 defeat to the Stormers in Cape Town.
The Bulls suffered a sixth consecutive loss across competitions despite pushing the unbeaten Stormers all the way in a Vodacom URC north-south derby that was decided by a 79th-minute lineout-maul try from replacement prop Ntuthuko Mchunu.
Bulls flyhalf Handre Pollard levelled the scores early in the second half but missed two further shots at goal, while the Stormers were more clinical late on.