This article is about the second Challenger tournament held in Portorož. For the other Challenger tournament in Portorož, see ATP Challenger Portorož-2 .
The ATP Challenger Portorož (official name: Challenger Slovenia Open ) is a tennis tournament that has been taking place in Portorož since 2013 . It is part of the ATP Challenger Tour and is played outdoors on hard courts. Sjarhej Betau is the record winner with his two wins in doubles.