SCOTTSDALE — Tony Vitello is a fan of the World Baseball Classic and figures to tune in whenever he gets a breather from his busy Giants schedule. If he happens to catch Venezuela over the next week, he’ll be looking for something very specific. Vitello noticed recently that second baseman Luis Arráez has made noticeable strides when attempting to start a double play on balls hit to his left. It has been one of many intricacies that Arráez has been working on during daily work with infield instructor Ron Washington, and Vitello is curious to see if that carries over into games. “It’s just improvement — and, like, drastic improvement on one particular play,” Vitello said. “It looked completely different than it did (earlier) in a three-day window.”What Vitello saw with the improved footwork and adjustment to the way Arráez feeds Willy Adames is exactly what the Giants anticipated when they hired Washington, known as one of the best to ever coach infielders. It’s also what they expected when they signed Arráez to a one-year deal late in the offseason. The Giants...