Major League Baseball is investigating allegations of domestic violence levied against Chicago Cubs shortstop Addison Russell by a friend of his wife.In a post on Instagram, Melisa Russell accused her husband of adultery on Wednesday and indicated she was exiting the relationship."Being free to be able to make your own choices," she wrote in the since-deleted post, "beats being cheated on, lied to & disrespected any day. #herestonewbeginnings #onlygetsbetterfromhere."MLB vice president Pat Courtney told USA Today Sports on Thursday that it "will look into the allegations." Russell issued a statement Thursday afternoon denying the allegations."Any allegation I have abused my wife is false and hurtful," Russell said in the statement. "For the well-being of my family, I'll have no further comment."An All-Star last season, the 23-year-old Addison Russell is batting .209 with three homers and 19 RBIs in 2017.--Houston Astros ace Dallas Keuchel was placed on the 10-day disabled list due to neck discomfort.Keuchel was scratched moments before Wednesday's scheduled start against the Kansas City Royals. Astros manager A.J. Hinch said after the contest that Keuchel was scratched due to illness.Instead, Keuchel traveled to Houston on Thursday to have his neck examined. The left-hander missed a start in May due to a pinched nerve in his neck. Astros general manager Jeff Luhnow told reporters that there is no timetable for Keuchel's return.Keuchel is 9-0 this season and leads the majors in victories, ERA (1.67) and WHIP (0.87).Houston recalled right-hander Francis Martes from Triple-A Fresno. Martes was 0-2 with a 5.29 ERA in eight starts at Fresno.--Baltimore Orioles third baseman Manny Machado was not in the starting lineup Thursday when the Baltimore Orioles played the Washington Nationals in a makeup game from a May 11 rainout.Machado left Wednesday's game in Baltimore against the Pittsburgh Pirates with left wrist soreness. He was injured in the top of the second inning when Pirates outfielder Andrew McCutchen slid into Machado on a steal of third.Machado walked into the Orioles clubhouse around 4 p.m. Thursday with a soft brace on his left wrist. He then went into the office of manager Buck Showalter, and Machado's name was not on the lineup card that was posted about 5 p.m.--The Chicago Cubs placed right-hander Kyle Hendricks on the 10-day disabled list due to an injured middle finger on his pitching hand.The right-hander was scheduled to start Friday's game against the Colorado Rockies. Left-hander Mike Montgomery will start in his place.Cubs manager Joe Maddon said Hendricks' injury isn't serious. He is hoping rest will solve the issue.Hendricks is 4-3 with a 4.09 ERA in 11 starts this season. The 27-year-old is coming off a superb 2016 campaign in which he went 16-8, led the National League with a 2.13 ERA and finished third in NL Cy Young Award voting.