Though Johnson has started in 82 of 91 appearances during his five-year professional career, Giants vice president of player personnel Dick Tidrow projects him as a reliever. "His ball sinks and runs," Tidrow said of Johnson, who has struck out 434 in 446 2/3 Minor League innings.
Under terms of the Draft, if Johnson doesn't make San Francisco's Opening Day roster, he must be offered back to Baltimore for half of the $50,000 purchase price.
The Giants essentially traded pitchers with the Orioles, who drafted left-hander Ben Snyder with the third overall pick. Snyder, 24, was 4-4 with a 2.88 ERA in 34 appearances (five starts) for Double-A Connecticut in the regular season. He compiled a 33-19 record and a 2.98 ERA in four seasons in the Giants system.
The Orioles then sent Snyder to the Rangers on Thursday to complete the deal for pitcher Kevin Millwood.
In the Draft's Triple-A portion, the Giants lost outfielder Brian Horwitz, a six-year member of the organization, to Cleveland.
"He's a good kid and a good hitter and he needs a change of scenery," Tidrow said.
Horwitz, 27, has a .316 batting average but only 22 home runs in 2,104 Minor League at-bats. The University of California graduate hit .222 with two homers and four RBIs in a brief promotion to San Francisco in 2008.
Also in the Triple-A phase, the Giants plucked left-hander Jake Stevens from Baltimore's system. Stevens, 24, finished 5-6 with a 4.42 ERA in 34 relief outings for Class A Frederick last season. He's 37-42 with a 4.23 ERA in six professional seasons while dividing his duties between starting and relieving.
The Dodgers raided the depths of the Giants' system to draft right-hander Raul Burgos in the Double-A portion. Burgos, 22, has never pitched above rookie-level ball in three professional seasons. He finished 2-0 with a 5.82 ERA in 15 relief appearances for the Giants' Arizona rookie-league club last season.