Jonah Heim hit a walk-off single to center to score Josh Smith and the Texas Rangers completed a three-game sweep of the Tampa Bay Rays with a 4-3 victory Sunday in Arlington, Texas.Edwin Uceta (0-1) sat down the first two batters he faced in the bottom of the ninth before Smith hit a double to left. Two pitches later, Heim followed with his game-winner.Corey Seager hit his first home run of the year for the Rangers, who’ve won eight of 10 to start the year. Marcus Semien and Leody Taveras added RBIs.Smith finished 3-for-4 and scored two of the hosts’ four runs.Rangers starter Kumar Rocker had a much better day after giving up six runs in three innings in his season debut last Monday at Cincinnati. Rocker scattered six hits over five innings of one-run ball Sunday, with one strikeout.Jacob Webb (1-0) struck out two in the ninth.