SAN FRANCISCO -- Hard-throwing pitching prospect Melvin Adon was among a trio of right-handers selected to the Giants' 40-man roster Tuesday ahead of the Dec. 13 Rule 5 Draft.
Adon, whose fastball has reached 102 mph, is coming off an Arizona Fall League campaign in which he struck out 21 and walked three in 12 1/3 innings spanning 10 appearances for Scottsdale. He allowed just seven hits.
The 24-year-old Adon, who's ranked 19th among Giants prospects by MLB Pipeline, also finished 2-5 with a 4.87 ERA in 16 appearances (15 starts) this year at Class A Advanced San Jose.
"He's a very talented young man with a great arm and a bright future ahead once he gains confidence and controls the strike zone better," said Giants special assistant Will Clark, who scouted Adon this past season.
Others added to the 40-man roster were Sam Coonrod and Logan Webb.
Coonrod, 26, spent most of 2018 recovering from Tommy John surgery. Ranked No. 30 on MLB Pipeline's organizational prospects list, he struck out 23 in 11 2/3 innings over 10 appearances, which were divided between Rookie League and San Jose.
Webb split the 2018 season between San Jose and Double-A Richmond. His combined ERA was 2.41 in 27 games (26 starts). A California League Mid-Season All-Star as well as the Giants' No. 11 prospect according to MLB Pipeline, Webb limited right-handed batters to a .187 average.
The Giants also outrighted right-hander Chase Johnson to Triple-A Sacramento. San Francisco lost right-hander Julian Fernandez, who was claimed off waivers by the Marlins.
San Francisco has 36 players on its 40-man roster.