Around the horn: Showalter said Triple-A Norfolk right-hander Edwin Jackson is "an outing or two away" from becoming an option for the big league club. Jackson has made two appearances for the Tides — one three-inning start and a 12/3-inning relief outing — and has posted a 1.93 ERA. Showalter said the fact that Jackson isn't optionable won't impact the club's decision to promote him if he's the best available pitcher. … Right-hander Gabriel Ynoa (right hamstring strain) has been doing some light throwing off flat ground, but isn't to the point yet where he is ready to throw off a mound. "Hopefully he'll get off the mound here in not too long," Showalter said. … Showalter said the early reports on outfielder Michael Bourn's start at Norfolk are good. "Mike is moving well, playing good in the outfield as we knew, and he doesn't seem to be having any repercussions from the broken finger. That's been encouraging," Showalter said. Bourn entered Friday 3-for-11 with two walks in three games with the Tides. … The Orioles will wear special Mother's Day jerseys and caps both Saturday and Sunday. Those jerseys will be auctioned off on orioles.com/auction to benefit The Breast Cancer Program at the Johns Hopkins Kimmel Cancer Center, specifically the John Fetting Fund For Breast Cancer Prevention. Last year's auction raised more than $19,000.