NORMAN — After three dismal weekends in a row, the Sooners will look to build some momentum in their final regular-season series. Oklahoma (31-18 overall, 13-14 SEC) will battle Tennessee (35-18, 13-14) in a three-game series running from Thursday to Saturday at Chickasaw Bricktown Ballpark in Oklahoma City. The Sooners are 3-6 in their last nine SEC games, losing series to Auburn, Florida and Arkansas over the last three weekends. OU’s most glaring issue over the last few weeks has been pitching.  In the Sooners’ last five contests, they have given up 57 runs. LJ Mercurius and Cameron Johnson — OU’s starters on Friday and Saturday, respectively, against Arkansas — combined to allow nine earned runs on eight hits and four walks in their outings against the Razorbacks. Heading into the final week of the regular season, Oklahoma’s 5.23 team ERA ranks 13th in the SEC , ahead of only Vanderbilt, LSU and Missouri.…