Lopez was recalled by Nationals and will start Saturday against the Giants, MASN's Dan Kolko reports.
The 22-year-old will oppose Jake Peavy in his second career start at the major league level. Lopez gave up 10 hits in his debut earlier this month, but also fanned nine over 4.2 innings, with his fastball averaging over 96 mph in the outing. The matchup Saturday makes him appealing as a streamer in a lot of leagues, as the Giants have scored just 41 runs since the All-Star break (second-fewest in the NL), although they are getting Hunter Pence back.