Description: Austin Jackson is heading to the Mariners as part of a three-team trade between Seattle, Detroit and Tampa Bay.
Insight: Mariners' center fielders have the lowest OPS in baseball this season so Jackson will be a big upgrade, but he'll be more valuable to Seattle than fantasy owners even though he's batted .361 with 13 extra-base hits in his last 24 games. He'll have fewer run scoring opportunities with the Mariners and doesn't offer many homers or steals.
Description: Tigers center fielder Austin Jackson has batted .343 with 10 doubles, two triples, one homer and 18 runs in July and he has a good matchup Thursday.
Insight: Jackson is 16-for-42 (.381) with three homers in his career against White Sox starter John Danks. Detroit had Jackson hitting fifth and sixth in the order earlier this season, but he's clearly more comfortable leading off. He's hitting .327 in 107 at-bats as the leadoff hitter this season and should remain in that spot.
Description: Orioles center fielder Adam Jones has hit five home runs in his last 11 games/
Insight: Jones has batted .255 in July, but he's hit six home runs and driven in 18. The center fielder is having another outstanding season, hitting .294 with 21 home runs, 67 RBI, 63 runs and six steals.
Description: Athletics center fielder Coco Crisp (neck) will be held out until at least Friday, according to John Shea of the San Francisco Chronicle.
Insight: Crisp hurt his neck a couple months ago when he crashed into the outfield wall and the injury hasn't gone away even though the A's have given him frequent days off since then. A's manager Bob Melvin said Crisp's MRI showed "no changes."
Description: Rockies outfielder Drew Stubbs is questionable for Tuesday's game against the Chicago Cubs while dealing with a sprained left ankle.
Insight: Stubbs has enjoyed his first season in the light Colorado air, batting .302 with 11 HR and a career-high .855 OPS. The Seattle Mariners are thought to be asking about his availability, according to Jon Morosi of FOX Sports.
Description: Diamondbacks center fielder A.J. Pollock (hand) will take live batting practice against rehabbing pitcher Daniel Hudson on Tuesday and then begin a rehab assignment. SOURCE: mlb.com
Insight: Pollock fractured his right hand when he was hit by a pitch on May 31 and underwent surgery. He was on a tear before the injury, hitting .359 with 13 doubles, four triples, six homers, 14 RBI, 24 runs, eight steals and a 1.061 OPS in his last 39 games.
Description: Athletics center fielder Coco Crisp has returned to Oakland to have his neck examined, according to Joe Stiglich of csnbayarea.com.
Insight: Crisp hurt his neck a couple months ago when he crashed into the outfield wall and the injury hasn't gone away even though the A's have given him frequent days off since then. He missed two of the past three games and won't be with the team for the three-game series that begins Monday at Houston.
Description: Giants manager Bruce Bochy said the team hopes to decide Monday or Tuesday when center fielder Angel Pagan (back) will begin a rehab assignment, according to Henry Schulman of the San Francisco Chronicle.
Insight: Pagan has a bulging disc in his back and hasn't played since June 14. He hasn't suffered any setbacks and should be back in the first week of August.
Description: Chicago outfielder Ryan Sweeney has gone 3-for-7 with two homers and five RBI his last two games and he's mashed against Cardinals starter Adam Wainwright.
Insight: Wainwright is one of the best in the game, but Sweeney is 5-for-12 (.417) with three doubles and a homer against him. He's only hitting .224 with a .588 OPS, but is a decent fantasy option Sunday.
Description: Washington center fielder Denard Span had his second straight four-hit game Friday at Cincinnati.
Insight: Eight hits, all singles for Span the past two games. In fact, he's gone 18-for-35 (.514) in his last eight games, but 17 were singles. He's hitting .289 with one homer, 21 RBI, 62 runs and 18 steals this season.
Description: Tampa Bay center fielder Desmond Jennings has had a nice month of July, going 20-for-64 with seven doubles, two homers and 14 runs.
Insight: He's still hitting just .249 because he came into the month batting .235. Jennings is on pace to finish with nearly identical numbers to the past two seasons. At age 27, he's likely not going to improve much from the player he is right now.
Description: Padres center fielder Cameron Maybin has been suspended for 25 games for amphetamines, according to Bob Nightengale of USA Today.
Insight: Maybin has tested positive for amphetamines twice. A first positive test results in additional follow-up testing but no suspension. "I have been undergoing treatment for several years for a medical condition, attention deficit disorder (ADD), for which I previously had a therapeutic use exemption (TUE),'' Maybin said in a prepared statement on Wednesday. "Unfortunately, in my attempts to switch back to a medicine that had been previously OK'd, I neglected to follow all the rules and as a result I tested positive.
Description: Since he started off May 10-for-62 (.161) with 22 Ks, Angels outfielder Mike Trout has batted .358 with 19 doubles, one triple, 15 home runs, 46 RBI, 39 runs and five steals in his last 49 games.
Insight: Trout went 2-for-4 with a solo homer, a walk and three runs Sunday against the Mariners. He's hitting .313 with 23 home runs, 74 RBI and an AL-leading 1.012 OPS.
Description: Los Angeles center fielder Mike Trout is a career .386 hitter with a 1.067 OPS against Felix Hernandez.
Insight: King Felix may be the best pitcher in baseball, certainly in the top-five, but Trout doesn't seem to have a problem with him. Trout leads the league in OPS (1.008) and total bases (214) to go along with his .313 batting average, 22 HR and 73 RBI.
Description: Rockies outfielder Drew Stubbs has homered in three of the past six games and has a favorable matchup Saturday night.
Insight: Stubbs has enjoyed his first season in the light Colorado air, batting .294 with 10 HR and a career-high .830 OPS. He's 9-for-25 (.360) with a home run against Pittsburgh starter Charlie Morton.
Description: Indians center fielder Michael Bourn (left hamstring injury) was originally on a 3-4 week timetable for his return, but that doesn't appear to be the reality of the injury.
Insight: Three weeks down the road and there is still no timetable for his return to the lineup. Even when he returns, he'll likely tone down his running game and without that his fantasy value is minimal.
Description: Yankees center fielder Jacoby Ellsbury went 2-for-4 with a homer, two RBI and a steal Friday against the Reds.
Insight: Ellsbury hit .346 in his first 28 games and he's batted .311 over his last 43, but a 10-for-75 (.133) stretch from May 4-26 has his average at .284 for the season. He has seven home runs, 44 RBI, 45 runs and 25 steals, so he's been a good fantasy option.
Description: Houston center fielder Dexter Fowler (intercostal) is not ready to return from the DL, according to Evan Drellich of the Houston Chronicle.
Insight: Despite not having the comforts of Coors Field (career .880 OPS there) to fall back on anymore, Fowler has put up similar numbers to last season. Unfortunately, this will be the sixth straight season in which he hasn't reached the 150-game mark.