The Waratahs are on a dangerous road after loosing at home against the Jaguares on Saturday.
The Jaguares came out and dominate the first half to take the game eventually 23-15.
The Waratahs just could not get into the game in that first half again making too many mistakes when they did had the ball.
The Jaguares started the match well going into a early lead and never let down even though the Tahs did came back at them in that second half.
The Tahs came to two points behind the visitors after a try by Rona but just could not build on that in the final 15 minutes.
The Jaguares were good in their scrabble defence and force the Waratahs to make a lot of handling errors on contact in defence.
The home side got nothing out of the game which may haunt them at the end of the season making it almost impossible to get to the top spot of the Aussie conference.
The best they can go now for is a place in the top eight in the playoffs.
They trail the Brumbies by eight points and the Rebels bu seven with eight losses from 13 games this season.
The Waratahs as will the Nationals side later are missing the service of Israel Folau.
Beale has just not worked at 15 and they missing that quality of Folau.
The Jaguares enjoyed 70% of possession in that first 20 minutes which secured them the game at the end.
It was clever play from the Jaguares that led to their first try in the 25th minute. A grubber was put through and speedy Jaguares winger Ramiro Moyano beat everyone to the ball to score.
They starved the Tahs form ball and quickly had a 10-3 lead on the board.
With this win the Jaguares went clear on top of the SA conference.
Waratahs: Tries: Penalty Try, Curtis Rona Penalty: Bernard Foley
Jaguares: Tries: Ramiro Moyano (2) Conversions: Domingo Miotti (2) Penalties: Domingo Miotti, Joaquin Diaz Bonilla (2)