Dave Martinez has reached a crossroad.
Most people – myself included – will normally cite his mismanagement of the bullpen when it comes to criticism of the Nats' manager. But his construction of the batting order this season has also seemed rather archaic at times.

Davey doesn’t like to experiment with his lineup unless he has to. The Nationals are 12thin the majors in OPS, but they’re 28th in runs scored per game. If that doesn’t suggest a lineup change is necessary, nothing will.
The old school of thought in baseball was to hit your quickest player leadoff, a good hitter with speed second, your best overall hitter third, the hitter with the most pure power fourth, your next best “RBI guy” fifth, and the rest of your batters in order of ability after that.
Times have changed. There’s data suggesting that the No. 2 hitter across the MLB typically steps up to the plate in the most high-pressure situations, and that the importance of including speed at the top of the lineup is of diminishing importance. That doesn’t even factor in separating same-sided hitters, or who’s most comfortable hitting in each given spot in the lineup.
Davey deserves credit for trying Juan Soto in the No. 2 hole recently. Using Adam Eaton there in the past was often crippling. But there’s still more work to be done.
I’d start at the heart of the lineup. Since Josh Bell and Kyle Schwarber’s regular-season debuts – and even during Spring Training – they’ve been hitting directly behind Soto. In some ways, that makes sense, but it’s also not quite ideal. Soto and Schwarber are both left-handed hitters, and Bell is a switch hitter, meaning he’ll normally hit from the left side – since most pitchers are right-handed. Particularly late in games, that gives opposing managers a strategic advantage. If they bring in a left-handed reliever to face them, the production of the trio will become much more limited than they’re otherwise capable of.