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The Texas Rangers optioned second baseman Rougned Odor to triple-A Round Rock.
Odor hit .144 in 29 games. He struck out 25 times in 90 at-bats.
Odor was 20 and the youngest player in the majors when he made his major league debut last May. He hit .259 in 114 games in 2014.
The Cincinnati Reds designated reliever Kevin Gregg for assignment.
The Reds signed Gregg to a minor league deal in the off-season. He was 0-2 with a 10.13 earned-run average in 11 appearances, giving up 12 earned runs and three home runs in 10 2/3 innings.
New York Yankees right-hander Masahiro Tanaka is scheduled to throw a bullpen session Tuesday, his first since going on the 15-day disabled list last month because of a right forearm strain and right wrist tendinitis.