Harry Potter scored two tries as Leicester reached the European Challenge Cup semi-finals for a second successive season with a 39-15 win over Newcastle. Winger Potter's brace was boosted by a score also for Argentine centre Matias Moroni while Newcastle's indiscipline cost them two penalty tries. Newcastle's tries came from full-back George Wacokecoke and winger Tom Penny. Northampton's bid to reach their first European semi-final since 2014 ended in a 35-27 defeat by Ulster. Saints overcame the loss of three forwards to yellow cards in the first half to lead by eight points at half-time but Ulster's dominance of territory and possession eventually told. Tommy Freeman scored two tries for Northampton. Alex Mitchell and Ollie Sleightholme scored the others, with Piers Francis kicking a penalty and two conversions. Rob Herring, Jacob Stockdale, John Cooney and Marty Moore scored tries for Ulster. There was also a penalty try award, with Cooney adding four conversions. Montpellier, the champions in 2016, made the last-four with a 31-25 win over Treviso. Scrum-half Benoit Paillaugue claimed 22 of Montpellier's points, a haul which included two tries. On Friday, Bath reached the semi-finals for the seventh time with a four-try 26-13 win over London Irish. dj/jc