Beato, who underwent Tommy John surgery two seasons ago, said there were a few teams interested in him, and that the Orioles are a "perfect" fit.
"They have a lot of young pitching," Beato said about the Baltimore organization.
The 6-foot-5, 215-pound native of Brooklyn, N.Y., said he tries to model himself after Roger Clemens.
"His work ethic is amazing," Beato said.
Baltimore has also signed its draft picks from the ninth (left-hander Bret Bordes), 18th (left-hander Nathan Nery), 19th (shortstop Todd Davison), 21st (outfielder Luis Lopez) and 28th (catcher Michael Pierce) rounds.
Thirteen of the first 24 players the Orioles drafted have reached agreements with the team.
Mora in lineup:
Melvin Mora, who has left the last two games after being hit in the left knee, was in Wednesday's starting lineup.
At Shea Stadium on Sunday, Mora was hit near the knee by a line drive. Mora was hit by a pitch on the side of his left knee in Tuesday's game, and went down in pain in the batter's box and had to be carried off the field.
"I want to play. ... I'm OK now," Mora said.
Mora added that when he was hit Tuesday, he initially thought the injury would be more serious. But Mora was able to walk without a noticeable limp after the game.
Loewen on Saturday:
Rookie Adam Loewen will make his fifth career start Saturday, when the Orioles host the Nationals.
Loewen has pitched poorly in his first four starts, going 0-2 with a 7.40 ERA. In 20 2/3 innings, Loewen has given up 20 runs (17 earned) and 26 hits.
"We just want him to pitch as good as he can pitch," manager Sam Perlozzo said. "We just hope he continues to get better."
Left-hander John Halama, who was designated for assignment Friday by the team, cleared waivers and refused an assignment to Triple-A Ottawa, and was given his outright release.
Halama was 3-1 with a 5.02 ERA in 16 games with the Orioles this year.
Futures stars? Two Orioles prospects were named to the roster for the XM Satellite Radio All-Star Futures Game, which will be played July 9 in Pittsburgh.
Right-hander Radhames Liz was named to the World Team roster, while outfielder Nolan Reimold will play for the United States team. They are teammates with the Class A Frederick Keys.
Liz is 5-4 with a 2.72 ERA in 14 starts this season, leading the Carolina League with 89 strikeouts. Reimold is hitting .274 with nine home runs and 41 RBIs.
The Orioles selected Reimold in the second round of the 2005 draft, and signed Liz as an undrafted free agent.
In-stadium All-Star balloting at Camden Yards ended Tuesday night, but votes can still be cast online at MLB.com.
Online voting will take place until June 29 at 11:59 p.m. ET.
The Orioles and Marlins finish a three-game series at 7:05 p.m. ET on Thursday at Camden Yards. Kris Benson (8-5, 4.32) starts for Baltimore, while lefty Scott Olsen (6-3, 4.70) pitches for Florida.