Strasburg, the top overall pick in last year's MLB Draft, has started 10 games between the Nationals' Double-A Harrisburg and Triple-A Syracuse affiliates, going 6-2 with a 1.43 ERA. He has 60 strikeouts in 50 1/3 innings and has walked just 12.
The 21-year-old's professional debut came against the Double-A Altoona, on April 11, when he struck out eight over five innings in a 6-4 Harrisburg win. Altoona later handed Strasburg his only loss in Double-A on May 2, scoring four runs (three earned) off six hits and three walks over 4 2/3 innings in a 6-1 win.
The Pirates will likely start left-hander Zach Duke against Strasburg.
-- Matt Fortuna