BALTIMORE -- Backup catcher Craig Tatum experienced some soreness in his right knee during Sunday's game against the Rays, but fortunately Tuesday's MRI showed no damage.

Tatum, who took the team's regularly scheduled batting practice prior to Tuesday's game, said he wasn't worried about his knee and was planning on playing regardless.

"I don't want to miss anymore time," he said, prior to the MRI results. "No matter what it was, I think I could play through it."

Orioles manager Buck Showalter thinks that Tatum would avoid the disabled list, and given the encouraging test results, it figures to be a minor injury. Tatum said he had never experienced the knee soreness before Sunday, but played with it the entire game so he wasn't worried about it hampering his performance.

O's glad to seal deal with Machado

BALTIMORE -- With three minutes to spare -- by scouting director Joe Jordan's estimates -- the Orioles agreed to terms with third overall Manny Machado late Monday night, doling out the second-largest signing bonus in team history.

"[President of baseball operations Andy MacPhail] called that a long time ago," manager Buck Showalter said of the down-to-the-wire deal. "He said that will go down to the last 10 minutes. He said, "I'm not going to blink. But we'll see.'"

Considering one of three stand-alone talents in this year's Draft, Machado -- a high school shortstop from Miami, Fla. -- will automatically become one of the organization's premiere infield prospects.

"It's good," Orioles center fielder Adam Jones said of the addition. "Let's get him started, see how fast they can get here. They say [Machado is] pretty good. He's touted.

"It's a good start to his pro career and I look forward to meeting him next year at Spring Training."

With Machado's signing, the Orioles agreed to terms with 39 of their 49 selections, a hefty haul and the most signings since Jordan became scouting director in 2005.

"It's a very well-rounded Draft," Showalter said. "I know Joe's excited about it. From all facets of amateur players."

Worth noting

Orioles ratings have continued to skyrocket under Showalter, with the Orioles' 5-4 walk-off win on Monday night against Mariners the highest-rated program in the Baltimore media market in the coveted 10-11 p.m. ET slot. The Orioles' 6.4 HH rating beat out Dateline, CSI: Miami, and every other broadcast offering in the time slot. The game's entirety drew a 4.7 HH rating, which is the team's average television rating under Showalter's 10-4 tenure. That rating is 42 percent higher than the Orioles' season average before Showalter took over, when the team earned a 3.3 HH average on MASN. ... Nick Markakis hit his 200th career double in the 11th inning of Monday night's game. He scored on Adam Jones' two-out bunt single. According to Elias, the last player in the Major Leagues to win a game with a walk-off bunt in extra innings was Melvin Mora on Sept. 27, 2007 against the Yankees. ... Wednesday's starter Jeremy Guthrie has made six consecutive quality starts and leads the staff with 16 total. ... Orioles reliever Jim Johnson (right elbow inflammation) tossed two scoreless innings for Class A Advanced Frederick. Johnson is expected to take two days off before throwing back-to-back outings.