ST. PETERSBURG, Fla. — The budget-conscious Tampa Bay Rays saved some money and added some promising bullpen help Tuesday night when they traded infielder Akinori Iwamura to the Pittsburgh Pirates for right-hander Jesse Chavez.

The Rays held a $4.85 million option on Iwamura for next season, but did not intend to pick it up because of the depth they have at second base.

"We've got areas we really need to try to address," Rays executive vice president of baseball operations Andrew Friedman said, specifically mentioning the bullpen and catcher as priorities this offseason.

Iwamura hit .290 with one homer and 22 RBI in 69 games during the final season of a $7.7 million, three-year contract he signed after playing for the Yakalt Swallows in Japan. He signed with the Rays as a free agent in December 2006.

The 30-year-old missed 81 games this season after sustaining partial tears of the anterior cruciate ligament and meniscus in his left knee. Once the Rays determined they were not going to pick up his option for 2010, Friedman listened to offers for a trade.

"Pittsburgh has been all over us for about a month," Friedman said.

Chavez led Pittsburgh and all major league rookies with 73 appearances in 2009, going 1-4 with a 4.01 ERA in 67 1/3 innings. He was taken in the 42nd round in 2002 by Texas, and made his major league debut with the Pirates with 15 appearances in 2008.

Iwamura was a five-time All-Star and six-time Gold Glove third baseman in Japan. In three seasons in Tampa Bay, he batted .281 with 14 homers, 104 RBI and 29 stolen bases while playing third base for one year and second for the past two.

His unselfish transition from third to second base in 2008 — a move that opened a position for All-Star Evan Longoria — was one of the keys to Tampa Bay's change from a perennial last-place team into AL champions.

The Pirates badly needed a second baseman after trading NL All-Star Freddy Sanchez to Giants before the trading deadline.

"He is a good athlete with above-average speed and is a tough out with a solid career on-base percentage," Pirates general manager Neal Huntington said.