Saracens edged closer to the European Cup quarter-finals on Friday with a gritty 16-13 victory over Ospreys which ended the Welsh side\'s six-year, 17-match unbeaten home record in the tournament. The win gave the English champions 14 points at the top of Pool Five, two ahead of Biarritz who picked up a bonus-point 29-12 victory over Treviso while defeat virtually ended Ospreys hopes of making the last eight. In the night\'s other match, Edinburgh defeated Cardiff Blues 19-12 in Pool Two. Both sides are locked at the top on 13 points after the Welsh outfit collected a losing bonus point. In a bad-tempered clash at Swansea\'s Liberty Stadium, Saracens centre Owen Farrell and Ospreys fly-half Dan Biggar exchanged two penalties apiece for 6-6 after 26 minutes. But a minute later, the English Premiership champions, who won the first match between the two sides 31-16 at Wembley last weekend, grabbed the only try of the first half. An attempted clearance by Biggar was charged down by fly-half Charlie Hodgson before No8 Ernst Joubert, who scored at Wembley, was fastest to the loose ball to touch down. Farrell added the extras for a 13-6 lead which became 16-6 at the interval with another Farrell penalty awarded just after Ospreys prop Paul James had been yellow-carded. Biggar missed a penalty early in the second half before centre Ashley Beck, who scored twice at Wembley, had a try ruled out by the video referee when he fell short of the line. Saracens were reduced to 14 men when South African hooker Schalk Brits was red-carded Moments after his return, lock forward Kelly Brown was also sin-binned for tripping Biggar. Ospreys, who were comfortably on top at that stage, made the one-man advantage count with veteran lock Ian Gough going over in the corner off a sweeping pass from Biggar in the 65th minute. The fly-half nailed the conversion to cut Saracens\' lead to 16-13, but solid and tight defence saw the English side home. In France, Biarritz came from 12-3 down against Treviso to run in four tries and clinch a 29-12 win. Dane Haylett-Petty, Arnaud Heguy, Wenceslas Lauret and Iain Balshaw all scored tries. However, Biarritz\'s win was overshadowed by No 8 Imanol Harinordoquy being forced off the field after just 22 minutes with a left knee injury. Edinburgh avenged last week\'s 25-8 loss to Cardiff with a 19-12 which ended the Welsh side\'s perfect start to the competition. Tim Visser\'s first-half try and a 14-point haul from the boot of fly-half Greig Laidlaw earned Edinburgh a third win from four matches to put them in with a chance of a first quarter-final appearance in eight years. Dan Parks kicked three penalties for the Blues, who clinched a losing bonus point which could prove crucial when Leigh Halfpenny booted a 79th-minute penalty. Cardiff opted against handing a debut to centre Gavin Henson, but five of the team\'s World Cup players did start the game.