There's a sale going on at Nationals Park, and it's not at the team store. The Washington Nationals' atrocious defense doesn't seem like it's going to be shoring up any time soon. The Nats have given up 639 runs this year: that's second-most in the majors. Still, there are a couple possibilities:Shake up the catching situationBetween Keibert Ruiz and Riley Adams, the Nationals, according to Statcast, have been worth 13 runs below average at the catcher position. That's in the 3rd percentile of fielding runs per Statcast, and is a large contributor as to why the Nationals are 24th in MLB in that metric.