Miami Marlins third baseman Jake Burger (oblique) completed a full on-field workout ahead of Friday's game versus the division-rival Washington Nationals, throwing across the diamond for the first time since suffering a strained left oblique. Burger still has to progress to batting practice on the machine, but it's encouraging to see he's improving in his recovery. The 28-year-old infielder was slashing .228/.281/.421 with three home runs, two doubles, 15 RBI, and eight runs scored over 64 plate appearances (16 games) before heading to the injured list, and he's tracking toward a minor-league rehab assignment in early May and a return to the Marlins sometime in the middle of May. In Burger's stead, Emmanuel Rivera has served as Miami's primary third baseman but isn't producing enough to warrant consideration for a roster spot in the vast majority of fantasy leagues.

The Arizona Diamondbacks announced that starting pitcher Zac Gallen (hamstring) left Friday's start against the Seattle Mariners due to tightness in his right hamstring. Before exiting, Gallen surrendered three runs on three hits and one walk with three strikeouts over five innings of work. He was pulled from the game after his 64th pitch in the sixth inning and relieved by Scott McGough. Although the extent of the setback won't be known until Gallen is evaluated further, the D-backs and fantasy managers should be relieved the ace isn't dealing with an injury to his throwing arm. It remains to be seen if Gallen will need a trip to the injured list, or if he'll just need his next turn in the rotation skipped, but his next start is tentatively slated for Wednesday's series finale versus the division-rival Los Angeles Dodgers. The 28-year-old workhorse right-hander owns a 3.38 ERA, 1.22 WHIP, and 35:9 K:BB over 32 frames (six starts) this year.

Arizona Diamondbacks closer Paul Sewald (oblique) is scheduled to throw a bullpen session on Saturday, and the team will likely have him appear in another rehab game if all goes well there. There was some optimism that Sewald's next appearance would come for the major-league club, but it sounds like fantasy managers will have to wait a few more days before the hurler is reinstated from the 15-day injured list due to a strained left oblique. Look for the 33-year-old right-hander to re-enter Arizona's bullpen and reclaim his closing gig sometime during Week 5 of fantasy baseball, which begins on Monday with a three-game series versus the division-rival Los Angeles Dodgers. Righty Kevin Ginkel owns a solid 3.48 ERA (2.85 FIP), 1.16 WHIP, and 11:2 K:BB with four saves through 10 1/3 innings, but fantasy managers should be trying to make other arrangements for saves before he reverts to a setup role upon Sewald's return.

San Francisco Giants starting pitcher Blake Snell (groin) resumed playing catch on flat ground on Friday, which is a good sign for a player who is dealing with a multi-week absence due to a strained left groin. Snell believes he can rejoin San Fran's rotation right around May 7, when he's first eligible for activation from the 15-day injured list. The 31-year-old reigning National League Cy Young Award winner has obviously been a massive fantasy bust with an 11.57 ERA, 1.97 WHIP, and 12:5 K:BB through 11 2/3 innings (three starts), but his elite strikeout upside when healthy means he can't be jettisoned to any waiver wires. In the interim, former second-round pick Sean Hjelle may be needed as a starter for the Giants and has a 5.79 ERA and 0.85 WHIP with two punchouts and one walk in 4 2/3 frames this year. He'd line up for a decent matchup with the Boston Red Sox at some point next week in this case.

There is no timetable yet on Seattle Mariners shortstop J.P. Crawford (oblique), but general manager Justin Hollander said the team doesn't anticipate him being ready by the time he's eligible to be activated from the injured list. In a best-case scenario, it sounds like Crawford will be out at least two to three weeks with a Grade 1 right-oblique strain. The Mariners aren't going to rush the 29-year-old shortstop back with an injury that isn't easy to come back from, even if it's the least-severe variety. It's been a rough year so far for Crawford, as he's hit just .198 (17-for-86) with two home runs, nine RBI and 13 runs scored in his first 22 games. Until he's able to return, Dylan Moore should see most of the playing time at the 6 and will have elevated short-term fantasy value in deeper leagues.