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The Diamondbacks have acquired relief pitcher Saul Rivera from the Cleveland Indians for cash, and released Bob Howry. Rivera, age 32, had a 0.53 ERA in AAA Columbus, with 11K/7BB in 15 IP. Rivera had spent the four previous seasons in the Majors with the Washington Nationals, where he had ERAs of 3.43, 3.68, and 3.96, before slipping to 6.10 in 2009.  Rivera had been released by the Nationals this spring, and had signed a minor league deal with the Indians. Rivera throws a fastball in the high 80s, as well as a cutter and a slider. His K/BB ratios have never been very good, with a career strikeout rate of 6.2K/9 and 3.3BB/9. But he does keep the ball on the ground, and inside the park. For his career, he has a 51.2% ground ball rate and a 29.8% fly ball rate. Rivera has allowed only 15 HR in 275 major league innings, although he did allow 7 in just 38 innings in 2009. By releasing Bob Howry, the Diamondbacks are eating Howry's $2M contract for this year, as well as a $250K buyout for 2011. But with an ERA of 10.67 and 6 HRs allowed in 14 IP, there was no reason to keep running Howry out there. In his last appearance for the Diamondbacks on Sunday, Howry had allowed five batters to reach without recording an out.