From MASN's website, here is the list of games FOX will be picking up. These are usually 4:05 Saturday games, but they sometimes they switch the schedule up and the FOX games air at 7:05.
April 13: Braves at Nats
April 20: Nats at Mets
April 27: Reds at Nats
May 4: Nats at Pirates
May 25: Phillies at Nats
June 1: Nats at Braves
June 15: Nats at Indians
July 13: Nats at Marlins
July 27: Mets at Nats
We're finally getting some love from the national media - four consecutive Saturdays early in the season
As a reminder, FOX games are regional coverage. They typically have 4-6 games they pick up - each team's market will get to see their respective team's game, then they fill in the coverage in other areas of the country based on whatever game they feel will get the best ratings. The games against the Barves should get top billing; the game against the MiAAmi Marlins, maybe not so much...