ANAHEIM, Calif. -- Los Angeles Dodgers ace Clayton Kershaw was placed on the 15-day disabled list Saturday for the first time in his seven-year career because of a swollen muscle in his left upper back. The 26-year-old left-hander, coming off his second Cy Young Award in three years, already had been scratched from his scheduled start in San Diego on Sunday after an MRI revealed the problem. Kershaw was on a throwing progression program and was tossing the ball at different distances Saturday before the teams Freeway Series finale against the Angels when he experienced some discomfort on his 27th throw. "He felt it, and that was the last straw," manager Don Mattingly said. "So at that point, we knew we couldnt have gone any farther and that it was a DL situation. Its a situation -- not just for me, but for everyone -- that weve got to save Clayton from Clayton at this point and be cautious. We cant allow him to try to keep pushing and go forward. If it was up to him, Im sure hed want to go farther. But we cant allow him to do that right now." Kershaw, who signed a $215 million, seven-year contract on Jan. 15, won the Dodgers season opener 3-1 against the Arizona Diamondbacks in Australia last weekend. The three-time All-Star was hoping to get back in the rotation for Fridays home opener against San Francisco, but instead it will be Hyun-Jin Ryu, who also will get the assignment Sunday at San Diego against Andrew Cashner. Ryu started and won the second game of the Australia trip, but tore a toenail while running the bases that day and wasnt sure hed be able to fill in for Kershaw until after his side session Friday. "I think that once Clayton felt something, he knew that he wasnt going to make his start on Friday," Mattingly said. "With his throwing progression, the fact that he stopped right away is all weve asked of him from the beginning: If you feel it at all, youve got to stop. And he stopped right away." Kershaw has made 33 starts, struck out at least 229 batters and logged 227 2/3 innings or more in each of the last three seasons -- including a career-high 236 innings last year, when he finished 16-9 with an NL-best 232 strikeouts and a 1.83 ERA. Kershaw led the majors in ERA for the third straight year, becoming the first pitcher to accomplish that feat since newly elected Hall of Famer Greg Maddux did it from 1993-95. Now that Kershaws run at a fourth straight ERA title has been adjourned for the time being, Mattingly wasnt making any predictions on when he will return to the rotation. The Dodgers have five off days scheduled between now and April 15. "This is not something that we say, OK, we think hell be ready by this date -- and if he doesnt get there, then its like, Oh, Claytons had a setback," Mattingly said. "We should just let it do what its supposed to do and let the medical staff do their work let them tell us what he could do. 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Dallas is trying to rebuild its defensive line after franchise sacks leader DeMarcus Ware was released and 2013 leader Jason Hatcher signed with Washington. Melton has 15 1/2 sacks in 48 career games but will be needed more as a disruptive force in the middle. His best years came in 2011 and 2012, when he had 13 of his sacks and 50 of his 63 career tackles. Melton was a running back in high school in the Dallas area before becoming a defensive lineman with the Texas Longhorns. He was a fourth-round pick by the Bears in 2009 and missed his rookie season with an ankle injury.dddddddddddd He will be reunited with former Chicago defensive co-ordinator Rod Marinelli, who now has the same title with Dallas after Monte Kiffin was reassigned after the Cowboys finished last in the NFL in total defence. "Its like youre betting on yourself," Melton said on the teams website. "I feel like with me and my rehab and coming back with Rod and the good defence thats here, I can get back to that form. I believe in that, and obviously they believe in me to get it done." Melton was arrested in December in Grapevine, where he went to high school, on charges of assault and public intoxication after police say he refused to leave a bar and fought with employees. Police say Melton was accused of punching the bar manager in the face and biting his arm. Meltons agent, Jordan Woy, said at the time that his client didnt start the altercation. ' ' '