Yankees also keeping an eye on Aroldis Chapman’s velocity

Scouts and fans weren’t the only people who noticed Aroldis Chapman’s velocity was down in Thursday’s season-opener. “It’s something we’ll keep an eye on,’’ pitching coach Larry Rothschild said before Saturday’s 5-3 loss to the Orioles in The Bronx. “We’ll see as we get into the season and it gets warmer.” The closer threw a…