O'Brien will be held out of the starting lineup for the fourth straight game Sunday against the Giants.

EDGE Analysis

O'Brien is typically called upon to face left-handed pitching, so it's not too surprising to see him take a seat yet again Sunday. His bat certainly hasn't done him any favors, as he owns a .509 OPS through 59 plate appearances, despite launching four home runs. Until the young outfielder can show some consistency, Chris Herrmann appears poised to see the majority of starts in left field, as he'll be making his third straight appearance in the starting lineup for Sunday's afternoon contest.

O'Brien is not in the starting lineup for Friday's game against the Giants.

EDGE Analysis

With an excellent right-hander toeing the rubber for the Giants (Johnny Cueto), it should come as little surprise that O'Brien is taking a seat for Arizona. Chris Herrmann will get the start in right field, while Yasmany Tomas plays left Friday.

O'Brien is out of the lineup Wednesday against the Phillies.

EDGE Analysis

Nobody questions O'Brien's raw power, but he has had a tough time getting to it in games, as big league pitchers have been exploiting the holes in his swing. O'Brien has a .125 average and 18 strikeouts in 40 career at-bats against righties, while hitting four homers with a .261 average in 23 at-bats against southpaws. It would not be surprising if he started sitting more frequently when right-handers are on the mound for the opponent.

O'Brien went 0-for-3 with a strikeout in Tuesday's loss to the Phillies, leaving five runners on base in the process.

EDGE Analysis

It was another tough night at the plate for the 25-year-old rookie, who is striking out at an alarming 39.3 percent rate. As a power hitter, strikeouts are part of the territory. But if O'Brien can't cut down on his strikeouts a little, he might lose playing time or get sent to Triple-A. He's slashing just .132/.179/.358.

O'Brien is out of the lineup Sunday against the Rockies.

EDGE Analysis

A trip to Coors Field is typically a good thing for fantasy owners, but O'Brien has failed to cash in, collecting just one base hit over the first three games of the series. As a result, he'll take a seat for the finale, giving way to Rickie Weeks in left field.

O'Brien is not in the lineup for Monday's game against the Phillies, according to MLB.com's Steve Gilbert.

EDGE Analysis

O'Brien blasted two home runs Friday but struck out five times over the last two games, so manager Chip Hale decided to hold him out Monday in favor of Rickie Weeks.

O'Brien went 2-for-5 with two homers and four RBI in Friday's 10-2 victory over the Phillies.

EDGE Analysis

The rookie now has three hits in 20 major league at-bats in 2016, all of them homers. O'Brien blasted an Adam Morgan offering 412 feet in the fifth inning to plate Michael Bourn and Paul Goldschmidt, and then took reliever Elvis Araujo deep with a 403-foot solo shot in the seventh. The 25-year-old slugger launched 66 round-trippers over his last three minor league stops, so the power isn't a surprise by any means. However, O'Brien will need to demonstrate much more consistency in getting on base in order to stick with the major league club.

O'Brien has been struggling since his call-up and might be trying to do too much at the plate, Matthew Bain of the Arizona Republic reports.

EDGE Analysis

Since getting promoted a week ago, O'Brien is 1-for-14 with six strikeouts in four starts. That one hit was a 433-foot home run, but otherwise the 25-year-old has looked lost. Diamondbacks manager Chip Hale said he wants O'Brien to remain aggressive but also be more selective. "I think you just have to swing at the better pitches, that you can handle," Hale said. "Sometimes there's balls in the dirt or balls out of the zone you're swinging at that we don't want him swinging at, but we don't want to take his aggressiveness away either."

O'Brien went 1-for-4 with a three-run home run in Sunday's win over the Marlins.

EDGE Analysis

The rookie was making just his second major league start, and he wasted no time in bashing a 433-foot shot to left field in the first inning. O'Brien was known for his power throughout his minor league career, and Sunday's display showed that the hype was warranted. He has struck out four times in eight at-bats thus far, but he should continue to see playing time against lefties and could develop into a decent source of power in the fantasy realm.

O'Brien had a rough game on Friday, going 0-for-4 with three strikeouts in a loss to the Marlins.

EDGE Analysis

The 25-year-old slugger was called up earlier in the day and got the start in left, batting fifth. O'Brien probably won't play everyday, as Arizona all of a sudden has a crowded outfield, but he could get occasional starts against lefties, like he did on Friday against Miami's Justin Nicolino.