Arizona Diamondbacks right-hander Zac Gallen (hamstring) is scheduled to throw a live batting practice session on Monday against outfielder Alek Thomas (hamstring). If everything goes well, Gallen could be reinstated from the 15-day injured list and return during the team's series against the Oakland Athletics from June 28-30. He was diagnosed with a strained right hamstring after his sixth pitch of the game on May 30 against the New York Mets. The D-backs later announced it was a Grade 1 hamstring strain for Gallen. Gallen was put on the injured list the next day. The 28-year-old has allowed a lot of hard contact so far in an injury-plagued season, but he still has fantasy ace potential when he's right, and the good news is he isn't dealing with an arm injury. Gallen should remain rostered in all fantasy formats with his return on the horizon.

Arizona Diamondbacks outfielder Alek Thomas (hamstring) played seven innings in center field and had three at-bats on Saturday in the Rookie-level Arizona Complex League and said his hamstring felt good. After an off day on Sunday, Thomas will take live batting practice against right-hander Zac Gallen (hamstring) on Monday and then head to Triple-A Reno for a minor-league rehab assignment. The D-backs are hoping Thomas will join the big-league roster for the June 28-30 series against the visiting Oakland Athletics. The 24-year-old center fielder had been scheduled to come off the injured list on May 7, but manager Torey Lovullo said Thomas felt something in his left hamstring after playing in a rehab game on May 5. He then received a platelet-rich plasma injection to alleviate swelling on May 13. When healthy, Thomas is a defense-first player for the Snakes.

The San Francisco Giants announced that pitcher Erik Miller will open the game against the Chicago Cubs on Monday. Miller last pitched on June 19, where he also started, and threw one scoreless inning with one walk and two strikeouts. The left-hander will start on Monday, but Spencer Howard is expected to follow him out of the bullpen and serve as the bulk reliever. Howard has struggled as of late on the mound, giving up seven runs (six earned runs) with five walks and four strikeouts over his last 3 1/3 innings of work. He does get a favorable matchup against a Cubs offense that ranks in the bottom half of the league in most categories. Still, Howard should only be considered in extremely deep formats on Monday.

Boston Red Sox outfielder Jarren Duran went 3-for-5 with one double, two RBI, and one stolen base in the team's 7-4 win over the Cincinnati Reds on Sunday. Duran has been one of the hottest hitters in baseball in June and is currently slashing .384/.443/.640 with four home runs, six doubles, three triples, 13 RBI, and nine stolen bases over the past 20 games. The outfielder has also tallied 12 multi-hit games during that span. Given this recent hot streak at the plate, he is a must-start in all fantasy formats moving forward. The 27-year-old currently leads the American League in triples (10) and is tied atop the doubles (22) lead with Aaron Judge and JJ Bleday.

The Baltimore Orioles designated Nick Maton for assignment ahead of Monday's series opener against the Cleveland Guardians. Maton was just called up by the Orioles on June 19 after appearing in 41 Triple-A games this season. But to make way for Heston Kjerstad's promotion, the utility specialist was designated for assignment. The 27-year-old only appeared in one game since he was up with the major league club, which happened to be in Baltimore's blowout 17-5 win over the New York Yankees on June 20. Maton will now go on waivers, where he could find a new team or wind up back in the Orioles' minor league system.