Brian Cashman knows the Yankees’ quick turnaround after their 1-4 start was important not just because of the standings, but because it helped his team breathe a little easier. “We just don’t want to turn up the heat on ourselves,” the general manager said. “There’s an avalanche of negativity that can follow poor performance, and if you can keep that stuff at bay, the more enjoyable your sleeps are.” That avalanche is something Ivan Nova could soon become familiar with. Nova said he will treat tonight’s outing against the Diamondbacks as he would any other, though he still has not gotten over being skipped last week. “I have to look at it like a regular start,” Nova said. “If I start doing anything differently, I’ll be in trouble.” Maybe, but the Yankees are looking for different results from the right-hander, who went 16-4 in 2011 but has been in a tailspin since last July. Nova’s disappointing first start of this season — when he gave up four runs in just 4 2/3 innings — followed a terrible last few months of 2012. In his final 13 games a year ago, Nova went 3-6 with a 6.38 ERA and was left off the Yankees’ postseason roster. Originally scheduled to start last Wednesday’s eventual rainout in Cleveland, Nova had his turn passed over in favor of Phil Hughes on Thursday. When that game was washed out as well, Hughes was tabbed to take Andy Pettitte’s spot when Pettitte was sidelined with back spasms over the weekend. Now that Pettitte’s next start has been moved to Friday, Nova will get another chance.