The Tampa Bay Rays were active in the trading market on Thursday, making trades with two teams.They acquired left-hander Dan Jennings from the Chicago White Sox early Thursday in exchange for switch-hitting first baseman Casey Gillaspie. Later in the day, the Rays announced they obtained first baseman Lucas Duda from the New York Mets in exchange for minor league right-handed pitcher Drew Smith.Jennings posted a 3-1 mark with a 3.45 ERA and 38 strikeouts in 48 appearances (44 1/3 innings) this season. The 30-year-old owns a 9-7 record with a 3.12 ERA and 130 strikeouts in 165 career appearances (161 1/3 innings) with the Miami Marlins and White Sox.Gillaspie is batting .227 with nine homers, 44 RBIs and 45 runs scored in 95 games this season with Triple-A Durham. The 24-year-old will be placed on the disabled list for Triple-A Charlotte with a fractured right big toe sustained on Tuesday after he fouled a ball off his foot."Casey is a recent first-round pick who has shown a quality approach at the plate with some power throughout his minor league career," White Sox general manager Rick Hahn said. "He gives us yet another highly touted hitter who has stood out at every level in the Rays system and increases our organizational depth as we continue to add prospects to the system."Duda is a free agent at the end of the year, but Tampa Bay needs a left-handed hitter. The Rays placed left-handed batter Colby Rasmus on the restricted list on July 13, and that saved Tampa Bay about $2 million.Duda, 31, is hitting .246 with 17 homers this season.Smith pitched at three levels, including Triple-A, for the Rays this season. He has a combined 1.60 ERA in 31 appearances.