If it ain't broken, don't fix it - that is the approach taken by Waratahs coach Daryl Gibson ahead of tomorrow's clash against the Bulls in Sydney. After three consecutive victories - the most recent being a 21-6 win over the Cheetahs last weekend - the Tahs have opted for an unchanged team to take on the visiting Bulls at Allianz Stadium.The Bulls, on the other hand, have six changes to the team beaten by the Brumbies in Canberra a week ago."That's always nice," Waratahs captain Dave Dennis told the media in Sydney yesterday, referring to the same team being maintained."I think Daryl is trying to find a perfect combination. I think the team that is playing again this week has been a bit more consistent over the last couple of weeks, and that has shown in the relatively good wins."After a slow start to the season the Waratahs have become a threatening side in the Super rugby competition.Gibson's charges had won just two games in their first six matches of the season before turning the corner in a 49-13 win over Western Force.They have not looked back since, winning all three of their previous matches. The side from Sydney sits on equal points at the top of the Australian conference alongside the Brumbies.What will give the Tahs even more confidence is their impeccable record against the Bulls when playing at home. They have won seven of the 10 matches between the two sides that have been played Down Under.The last encounter that pitted the two sides was in 2014 when the Waratahs won 19-12.Bulls coach Nollis Marais and his men have earmarked Israel Folau as the danger man."We've looked at Folau and how he has played this season and we think we know exactly where we could target him," Marais said."If we are always going to make it a first-phase battle then we will always have problems. If we can play a bit more like we want to play then it will be a much better game."..