By The Associated Press Bob Clark had three homers, a triple and a single to drive in eight runs as the El Paso Diablos hit nine homers in a 20-8 Texas League baseball vic tory over the Midland Cubs Thursday night. Jay Peters had two hom ers for the Diablos. Doug Thomson, now 2-0, was the winning Amarillo pitcher. In other Texas League action, Amarillo shut out San Antonio, 5-0, Tulsa beat Shreveport, 9-2, and Arkansas and Jackson split a doubleheader. Arkansas took the opener, 2-0, but Jackson bounced back for a 5-2 victory in the nightcap. Gary Lucas of the Ama rillo Gold Sox shut up only five hits as the Sox shut out the San Antonio Dodgers, 5-0. LUCAS GOT the only run he would have needed in the bottom of the first when the lead off Sox batter, Joe Hicks homered. Later in the game, Dane Ilertsen ac counted for two more runs with his 14th homer of the season, Lucas’ record is now 7-15. Bill Swiacki, now 4-4, was the loser for the Dodgers. Ed Lynch went the dis tance for the Tulsa Drillers, striking out nine and giving up eight hits in the 9-2 victory over the Shreveport Captains. Marty Scott and Rick Lisi drove in two runs for Tulsa and Terry Pyka had a triple. Len Strelitz gave up only three hits as the Arkansas Travelers shut out the Jack son Mets, 2-0, in the first game of a tobleheader at Jackson, Miss. Neal Fiala, who had two hits, drove in one of the Arkansas runs. Strelitz is now 6-5. Loser Jeff Reardon is now 15-4. In the nightcap, Kelvin Chapman and Keith Bodie had two hits and one RBI each as Jackson took a 5-2 victory. Jeff Grose, now 3-2, was the winning pitch er for the Mets. Al Olm stead, now 4-3, was the loser for Arkansas.