Worth noting

• After allowing four runs on five hits and two walks in just one inning against the D-backs his last start, Sonny Gray bounced back in a big way Tuesday, tossing four shutout innings against the Padres while giving up one hit and striking out a pair.

• Catcher Derek Norris (back spasms) could return to the A's lineup on Wednesday for the first time since March 4, if everything went well with his workouts on Tuesday, according to Melvin.

• Outfielder Craig Gentry (lower back strain) did some running and hit a few balls off the tee on Monday, but there is still no timetable for when he could appear in a game.

• Pitchers Ryan Cook (shoulder inflammation) and Eric O'Flaherty (Tommy John surgery) each threw bullpen sessions on Tuesday. O'Flaherty's 18-pitch session marked his first off the mound going full distance to the catcher. Fernando Rodriguez (Tommy John) is scheduled to throw a simulated game on Wednesday.

• Pitching prospect Arnold Leon is in the midst of a terrific spring so far, as he has worked seven innings and allowed no runs on two hits and one walk while striking out six.

"He'll be a guy that knocks on the door in my opinion," Melvin said. "He looks a lot more comfortable and when you're more comfortable, obviously the talent level comes out more. At times, he's in the low 90s and he's got a couple of good breaking balls. He's got the repertoire to be a starting in the big leagues in my opinion."

Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.