BALTIMORE -- Buck Showalter hasn't had to use his first replay challenge yet.
But soon enough, there will be a play that the Baltimore Orioles manager feels an umpire called wrong and he'll have to consult with his replay guy to determine whether or not he wants to use a challenge.
Showalter said there's only one factor that makes him a little nervous about the process at this point.
"The only thing is the unknown, a little bit," Showalter said. "That's the only anxiety I think guys have right now. And the umpires do, too. There's just unknown."
Although it's unknown for Showalter, other managers across the major leagues are beginning to experience their first instant replay challenges.
On Monday, there were five challenges, two of which resulted in the initial call being overturned.
But the replay challenge that likely has been receiving the most attention took place in Tuesday's Giants-Diamondbacks game. In the fourth inning, Giants pitcher Matt Cain attempted to pick off Arizona's A.J. Pollock at first base.
Pollock was called safe. But Bochy and his crew felt that Pollock was out. Bochy challenged, but the call was upheld.
Shortly after, Pollock scored on a wild pitch. But it was a close play at the plate where Giants catcher Buster Posey attempted to throw out Pollock with Cain covering the plate.
Bochy came back out to argue but to no avail. He was already out of challenges.
Showalter said the Orioles' replay official told him that Bochy was right the first time, but the umpires ruled it to be inconclusive.
"That was my question in our meeting -- what are we calling inconclusive?" Showalter said. "From what I understand, I haven't looked at it yet, I would've challenged it just like Bruce did."
Despite the uncertainty that comes with the replay challenges, as well as not knowing how close calls will have to be for them to be ruled "inconclusive," Showalter said he is in favor of the new procedure.
"Every good thing starts somewhere," Showalter said. "I think as we get into it, three or four years from now, we'll wonder how we ever did without it."
UPDATES: Johan Santana threw 30 pitches from a full mound Tuesday. Showalter said that he worked in a mix of pitches, and that eventually the team would like him to have 10 miles per hour separation on his fastball and his changeup.
But Showalter said Santana's velocity currently is at just 85 MPH.
Dylan Bundy threw 25 pitches, all fastballs, from a full mound on Wednesday.
Troy Patton, who is currently serving a 25-game suspension, will pitch in an extended spring training game on Monday. Patton will be eligible to return April 29.
Showalter said right fielder Nick Markakis still has some soreness in his neck, but will be fine moving forward. Markakis played on Monday, his eighth straight Opening Day start, after some uncertainty whether he would play or not.
MORE DEBUTS: On Monday, Nelson Cruz and Delmon Young both made their debuts as Orioles. On Wednesday, Steve Lombardozzi started at second base, David Lough started in left field, and Ubaldo Jimenez was the starting pitcher, all making their first appearance for Baltimore. Ryan Webb also made his first appearance as a relief pitcher in the seventh inning.