Leeds and Wasps secured victories in Saturday's Amlin Challenge Cup action, while Worcester were beaten 26-21 by Connacht.
Leeds fought back to secure a 10-6 win at Bucuresti in a tie played in snowy conditions.
The game was played in the freezing cold with snow falling throughout the match and the Guinness Premiership side were grateful to number eight Rhys Oakley for a try with five minutes remaining to give them the lead which was crucially converted by Jason Strange to seal victory.
Strange had kicked a penalty in the first half whilst Bucuresti full back Florin Vlaicu had given his side the lead with a drop goal four minutes into the second half after kicking a penalty in the first half.
Number eight Rhys Oakley, the only survivor from the XV that lost to Harlequins last weekend, scored the only try late in the game in Romania.
Tom Varndell scored two tries and Dave Walder added four penalties as Wasps produced a strong second-half display to beat French side Bayonne 22-18, having trailed for a time at Adams Park.
The result means Wasps replace the visitors at the top of their Amlin Challenge Cup pool, and a win in France next week should all but ensure that they go through to the knockout stage.
Connacht beat Worcester 26-21 in Worcester, keeping Pool Four in Irish hands.
Connacht scored three tries to two for Worcester to make it three wins from three in the competition this season.
Connacht led 16-13 at the break after Ian Keatley and Fionn Carr crossed for tries in response to one from Tom Wood for Worcester.
Worcester levelled shortly after the restart but Connacht defended well and took the game to Worcester with Séan Cronin getting in for a try 17 minutes from time.
Connacht lead Montpellier by three points at the halfway stage and before the return fixtures against the Warriors at the Sportsground next Friday.
Petrarca Padova succumbed to a 35-16 home defeat to Albi, while Overmach Parma shocked Bourgoin 14-9. Racing Metro had no such worries with the italians, thrashing Roma 62-0.