Munster hero Ronan O'Gara's 20 points put a serious dent in Neath's Celtic League ambitions at the Gnoll tonight.
The Irish province proved too good in every department to run out 35-19 winners.
Neath were left to rue basic mistakes that handed the visitors two simple tries in the first half, which proved the difference in the end.
All Blacks coach Lyn Jones now has the task to get his side up for next weekend's difficult away trip to Edinburgh, where five points could sneak his side into a home quarter-final.
Fly-half Lee Jarvis kept Neath in touch with four penalty goals, but his side's reputation as the best defensive team in the competition took a battering as Munster ran in four tries.
In Galway, Connacht's unbeaten run in the Celtic League came to a crashing halt at the hands of Pontypridd.
The men from Pontypridd were in superb form, running out 40-0 winners against a side that had never been beaten by a Welsh team in the Celtic League.
Winger Gareth Wyatt scored a brace of tries and veteran fly-half Neil Jenkins chimed in with 12 points with the boot.
A late pair of tries to replacement back Matt Allen has put Cardiff into the Celtic League quarter-finals.
The Welsh capital beat Bridgend 37-12 at the Arms Park, and their bonus point for four tries puts them into the playoffs.
It was Cardiff's fourth win on end after a poor start to the season, while Bridgend crashed to their fourth consecutive loss after starting with wins over Newport and Borders.
Nicky Robinson (Cardiff) and Craig Warlow (Bridgend) each scored 12 points with the boot, but Cardiff's star-studded backline proved the difference on the day.
In contrast, the Ravens were clueless in attack and never looked like crossing the home try-line.
Edinburgh confirmed their place in the final eight with a 30-20 win over a gritty Ebbw Vale side, with talented scrum-half Mike Blair scoring a late try to give his team some breathing space.
The visitors to Eugene Cross trailed 10-13 at the break before British Lion backrower Simon Taylor and Blair scored crucial five-pointers.
And just when long-suffering Caerphilly fans thought their season couldn't get any worse, it did. Irish province Ulster left Virginia Park with a crushing 67-15 victory, with Ireland fly-half David Humphreys kicking 27 points.
Wales Head Coach Rob Howley talks to WRU TV's Sebastian Barrett about the 36-man squad he has just named for the forthcoming Under Armour series, which includes two uncapped players, Ospreys duo Sam Davies and Rory Thornton.
Head coach Rowland Phillips is deligthed he can now call BT Sport Cardiff Arms Park home for his Wales Women's side, who launch their international season next month with games against Scotland and UK Armed Forces in the heart of the capital city.
Wales Sevens star Sam Cross has put his home town club of Brynmawr on the map after winning a silver medal at the Rio Olympics with Team GB. His club have now honoured him by naming their players bar after him, as WRU TV discovered at the official launch, recently.
One of the newest members of the Principality Premiership, Bargoed admit it's proving to be a steep learning curve at the highest level, but are determined to become a force to be reckoned with. WRU TV visited the club last weekend when they took on Llanelli.
Table-topping Aberavon travel to north Wales to tackle RGC 1404 as both teams defend unbeaten starts to the season in the Principality Premiership. WRU TV's Graeme Gillespie visited the Wizards to see how their preparations were going for the game of the weekend.
The Half a Game initiative is currently sweeping across Wales and proving a major success. The scheme aims to give every young player at least half a game every weekend. WRU TV recently visited a festival in Narberth where clubs have fully embraced the initiative.
Both Bargoed and Swansea were seeking their first win of the Principality Premiership season this afternoon. It proved a fruitful day for the hosts - not only did they win, but Bargoed claimed a try bonus point.