(Photo by John McDonnell/The Washington Post)

Nationals right-hander Doug Fister, still building arm strength after recovery from right elbow inflammation, will make his return to major league competition Saturday, Manager Matt Williams said. Fister is scheduled to throw 45 pitches over three innings against the Marlins in Viera.

The Nationals continue to believe Fister will take his first turn in the Nationals’ rotation, so long as he experiences no setbacks. The composition of that rotation will soon become clear. Williams said he will announce the Nationals’ opening day starter tonight after the Nationals’ game against the Astros.

All signs point to Stephen Strasburg receiving his third consecutive opening day nod. Strasburg will start tomorrow, and if he remains on schedule that lines him up for March 31, with one extra day of rest thrown in. Gio Gonzalez is slated to pitch the day after Strasburg, with Jordan Zimmermann coming next. But, again, no official announcement has been made yet.

The Nats are about to face the Astros, and the game is live on MASN. Talk about it right here.