■ The Astros called up five players from Triple-A Round Rock on the first day of roster expansion on Monday. The team recalled pitchers Jack Cassel, former Lexington Legend Fernando Nieve and Alberto Arias, along with catcher and ex-Legend J.R. Towles, and purchased the contract of infielder Edwin Maysonet. Towles has played in 50 games for the Astros this season, hitting .143 with four homers and 16 RBI. He was hitting .304 with seven home runs and 28 RBI in 48 games for Round Rock.
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On the mound
■ Top Mets pitching prospect Jonathon Niese will be called up from Triple-A New Orleans to make his major-league debut in the heat of the playoff race Tuesday against Milwaukee. Niese will take the rotation spot left vacant when right-hander John Maine was placed on the 15-day disabled list a week ago because of a bone spur in his right shoulder. Niese was a seventh-round draft pick in 2005. The left-hander went 5-1 with a 3.40 ERA in seven starts for New Orleans.
■ The Yankees expect to activate right-hander Joba Chamberlain (rotator cuff tendinitis) from the DL on Tuesday. They plan to use him in the bullpen for the rest of this season, letting him build up arm strength before becoming a starter again in the future.
■ The Dodgers on Monday activated outfielders Andruw Jones and Delwyn Young from the 15-day disabled list and reinstated right-handed reliever Scott Proctor from the 60-day DL.
■ The Orioles activated outfielder Adam Jones from the 15-day disabled list in time to start against the Red Sox on Monday. Jones, sidelined with a broken left foot since Aug. 3, paid immediate dividends to the club by homering off Paul Byrd on the first pitch he saw in the first inning.
■ Boston's Kevin Youkilis was back in the lineup Monday after missing two games with flu-like symptoms.
■ The Nationals transferred outfielder Wily Mo Pena to the 60-day DL (left shoulder surgery).
One day after CC Sabathia pitched a controversial one-hitter against Pittsburgh, Milwaukee's general manager said he may lobby to have changes made to the way official scoring decisions are made.
Doug Melvin said he thought there should be a committee to decide scoring decisions like the one that may have cost Sabathia a no-hitter in the Brewers' 7-0 victory over the Pirates on Sunday.
"There could be possible reviews to see if there's a better way of doing it where there's not all the pressure put on one individual," Melvin said.
He suggested a three-person panel consisting of an official scorer and two writers.
"I thought of it before this play," he said. "It's not just because of this. There's becoming too many changes and too many people involved."
Sabathia tried to make a barehanded pickup of Andy LaRoche's softly hit grounder, but dropped it. Official scorer Bob Webb immediately ruled it a hit, explaining LaRoche was two-thirds of the way down the line as Sabathia was picking the ball up.