The Astros placed righthanded reliever Josh Fields on the 15-day disabled list and called up Paul Clemens from Class AAA Oklahoma City today. Fields excelled in his two scoreless relief outings last week, but he struggled bouncing back and is now on the DL with a strained right forearm. “We felt like he needed a little more rest,” Astros general manager Jeff Luhnow said of Fields. “We don’t expect it to be a long absence at all.” Clemens, 25, won his first start of the season for Oklahoma City on Friday, holding Memphis to three earned runs with three strikeouts over five innings. “He deserves it,” Luhnow said of Clemens, [...]