The D-backs traded for Bell after he suffered through a disastrous season with the Marlins.
After allowing back-to-back singles to start the third inning, Bell got Wilin Rosario to ground into a double play and then fanned Tyler Colvin to end the inning.
"Yeah, definitely a lot of nerves," Bell said after the D-backs' 11-2 loss. "I want to go out there and put up an eggshell the first one out."
D-backs manager Kirk Gibson has made pitching out of jams a point of emphasis early in camp, so Bell's Houdini act was a welcome sight.
"He managed that inning very good," Gibson said. "He gets a couple of guys on, nice executed pitch breaking down and away and gets the double play and gets out of the inning. That's what we're looking for."