It was another entertaining weekend of Welsh rugby which leaves us with a clearer picture of who is likely to reach the United Rugby Championship play-offs. The Scarlets are the story of the weekend as they claimed a memorable victory in South Africa over the Lions but the Rainbow Nation was not a happy hunting ground for the other three Welsh clubs who all lost. Back in Wales there were two enthralling Super Rygbi Cymru semi-finals with Ebbw Vale and Newport RFC coming out on top. Here are your winners and losers. The 24-year-old has endured a rough few months after breaking his collarbone in January but he was outstanding in just his second game back. Costelow controlled the game, which the Welsh team won 32-19, and had his foot on the Lions throat throughout the Scarlets ' emphatic victory in Johannesburg. The Wales outside-half kicked 12 points, including a long range drop goal and a penalty from 45 metres on the angle. His attacking game was excellent with his passing, peripheral vision and ability to change the point of attack getting the best out of his outside backs. Sign up to Inside Welsh rugby on Substack to get exclusive news stories and insight from behind the scenes in Welsh rugby. Costelow's defensive game was also a sight to behold, putting his body on the line to make nine tackles. Costelow will almost certainly be on the plane to Japan this summer after missing out on the Six Nations and seemingly falling down the pecking order. His battle with Ospreys rival Dan Edwards should serve Wales well for years to come. After a difficult year or so, it was great to see the young man in such fine form. The former Wales scrum-half has had it tough during his four years in charge of the Scarlets. This time last season there were many people calling for Peel's head after a nightmare season which included a home defeat to Georgian outfit Black Lion. But the Scarlets board have backed Peel and it looks like they were right to do so. After a solid summer of recruitment where the pack got strengthened the Scarlets have been significantly more competitive this season. There have been times where things haven't gone their way and during the first half of the season they fell on the wrong side of some tight games. But things have clicked in recent weeks, with an eye-catching victory over Leinster and a stunning victory over the Lions at Ellis Park yesterday moving the west Walians to within touching distance of the URC play-offs. Peel is a good man who demands high standards and has a reputation as an innovative backs coach. All the best coaches go through periods where they struggle, particularly early on in their careers, but it is how they bounce back which matters. Peel seems to have grown into his role and if he can lead the Scarlets into the play-offs and back into the Investec Champions Cup then this season will have been a success for the Llanelli -based club. The Super Rygbi Cymru semi-finals were two enthralling affairs, particularly Ebbw Vale's triumph over Llandovery at Eugene Cross Park. The Steelmen were staring into the abyss at half-time as free-flowing Llandovery held what looked like an unassailable 21-5 lead. But Ebbw Vale launched the best comeback of the season to overturn a 16-point lead to fire themselves into the final with a 29-28 win. Join WalesOnline Rugby's WhatsApp Channel here to get the breaking news sent straight to your phone for free Ebbw Vale will meet Newport in the final after the Black & Ambers beat Cardiff 35-20 in their own backyard with a tremendous performance. Their reward is an appearance in the first ever SRC final which will be played at Eugene Cross Park. The 25-year-old Plumtree got left out of Wales' Six Nations squad, with his discipline one of the key factors in his omission. But the Scarlets backrower seems to have taken any feedback given on board and was outstanding for the Scarlets in their victory over the Lions, as he was against Leinster a fortnight back. Plumtree was extremely physical throughout a high octane encounter played at high altitude in Johannesburg. He finished the game as top tackler with 17 and scored a crucial try early in the second-half. There have been numerous discussions in recent weeks about the merit of overseas players in Wales but signing the right ones can be worth their weight in gold. The Scarlets' former All Blacks backrower Vaea Fifita had a standout game at Ellis Park and it was his break and offload which led to the match-winning try for Johnny Williams. The Wales captain got aptly rewarded for his outstanding performances this season with a place on this summer's British & Irish Lions tour of Australia. While it wasn't to be the Ospreys' night in Durban, Morgan was one of the best players on the pitch. The 25-year-old was a menace at the breakdown throughout his time on the field and finished the game as the top tackler with 19, while three of them were dominant. Morgan also won three turnovers at the breakdown and stood out like a beacon in what was a disappointing evening for the Ospreys. It's official. This is now the Dragons' worst ever season since their inception in 2003. The Dragons have lost 16 games on the bounce and have only won once in the URC this season at home against the Ospreys on the opening weekend of the season, with the only other victory coming against Newcastle Falcons in the Challenge Cup. To their credit there was plenty of fight in their performance in Cape Town but it was not enough to prevent themselves falling to a comprehensive 48-12 defeat to the Stormers. The Dragons will have a new-look squad next season and it goes without saying there will be a huge onus on head coach Filo Tiatia to turn things around. Nobody is expecting them to turn into play-off contenders overnight but another horror season like this one would be unacceptable. The Ospreys' season has fizzled out in disappointing fashion and it looks as if that home Challenge Cup quarter-final defeat to Lyon last month knocked the stuffing out of them Mark Jones' side had plenty of quality and a strong pack but they were unable to stop the Sharks from claiming a comfortable 29-10 win in Durban on Friday night. This defeat means the Ospreys are mathematically out of the race to reach the URC play-offs with one round of the regular season remaining. Get the latest breaking Welsh rugby news stories sent straight to your inbox with our FREE daily newsletter. Sign up here. It is disappointing to see how what looked at one stage like a promising end of the season came to nothing. But the Ospreys should be better next season having recruited well up-front with the signing of Queensland Reds captain Ryan Smith and former Wales backrower Ross Moriarty from Brive, while Jones will have had a full pre-season as head coach. Cardiff's hopes of reaching the URC play-offs are hanging on by a thread after they endured a heavy 45-21 defeat to the Bulls in Pretoria on Saturday. The Welsh club could not cope with the explosive physicality of the South African outfit and crucially Cardiff did not succeed in bagging a fourth try which would have given Matt Sherratt's side a losing bonus point. Cardiff must now realistically beat the Stormers in Cape Town if they are to stand any chance of reaching the URC play-offs. The Welsh club have the attacking game to cause the Stormers problems and score tries but the big question surrounds whether they can cope with the South African sides physicality up-front.