"It's probably as simple as Carlos just getting a few hits, a couple bloopers to fall in there, hit a ball in the gap, and then all of a sudden, a lot of times a light turns on. But he's just struggling a little bit at the plate right now, and Scotty's swinging a little better."Big Unit update: Randy Johnson visited spine specialist Dr. Robert Watkins on Monday. Watkins examined the results of an MRI exam Johnson underwent Friday for glute tightness that caused him to go on the disabled list. Melvin said the club would have a clearer picture of Johnson's return schedule when he comes back Tuesday with those results. The manager said Johnson still eyes a return next week against the Dodgers, likely June 26, when he's eligible to come off the DL, although right now, it's unknown if that's realistic before hearing from Watkins. Johnson went 4-0 with a 1.82 ERA in his past five starts, making the DL stint a surprise to Melvin. Johnson has endured little aches and pains during the season, but Melvin said none affected the veteran like this one. "Usually it's one day, whether it's the day after or the next day, and then he's able to get through it," Melvin said. "Where this one was significant enough to where we had to put him on the DL. This is just something that popped up that has potential to pop up every now and then. We'll try to play cautious with it." No decision yet on Gonzalez: Melvin said he would decide Tuesday if he would skip Edgar Gonzalez's turn in the rotation with Thursday's off-day. Gonzalez took the spot-start in place of Johnson on Saturday, but he could be skipped to keep everybody on regular rest, which would start with Brandon Webb on Friday. "We'll see how Webbie is today," Melvin said. "We didn't feel like we taxed him too much. We'd like to keep it fairly consistent. I know Edgar would like to get in there, and he's warranted another start, yet when you go from [Nos.] 5 to 4, and spot-start a guy, it's probably better off if everybody's pitching well to stay on turn with these guys." D-backs for charity: Four D-backs will take part in a "Buses for Baseball" event before Tuesday's game at Chase Field. As part of a program taking place throughout the league, Tony Clark, Hairston, Orlando Hudson and Tracy will welcome several disadvantaged children, many of whom will watch their first Major League game. Besides the kids getting transportation and game tickets, the players will sign autographs, pose for photos and answer questions. Up next: A pair of lefties will take the hill Tuesday at 6:40 p.m. MST when the D-backs play the second game of a three-game set against the Devil Rays. Arizona's Doug Davis faces Tampa Bay's J.P. Howell.
Michael Schwartz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.