The Tampa Bay Rays strengthened their bullpen for the stretch run Thursday, acquiring left-handed reliever Dan Jennings from the Chicago White Sox in a trade for first base prospect Casey Gillaspie.
Jennings, 30, is 3-1 with a 3.45 ERA this season. His 48 appearances lead American League lefties and are tied for second among all AL relievers behind Cleveland's Bryan Shaw.
Jennings has limited lefty hitters to a .169 average and one extra base hit in 71 at-bats this year.