ABILENE — Senior Blake Walden pitched a complete game, allowing one run and six hits as the Lubbock Monterey Plainsmen notched a 5-1 victory over top-ranked Cleburne in the first game of a Class 4A Region I semifinal best-of-three series at Hardin-Simmons University on Thursday.Game 2 is 4 p.m. Friday at Hardin-Simmons.No. 4 Monterey (31-8) set the tone in the first at-bat of the game when Mike Mercado hit a triple off Cleburne junior ace Dylan Schneider (11-2). Mercado scored on a sacrifice fly by Sam Swindle for a 1-0 lead just two batters into the game.Monterey added a run in the third on an RBI double from Walden (7-3).Cleburne (29-5-1) got on the board in the bottom of the fourth when Spencer Suitt singled in Daniel Richardson. Tyler Anderson, who represented the tying run at the time, was thrown out at home on the play.The Plainsmen got that run back plus another in the top of the fifth to take a 4-1 lead. Monterey tacked on an insurance run in the top of the seventh, and Walden closed things out for the complete-game win.Walden allowed six hits, one run and one walk with five strikeouts.Schneider threw six innings, allowing nine hits and four earned runs with eight strikeouts.Monterey’s Jake Hohenberger went 2 for 3 with two RBIs while Evan Gayler was 3 for 4 with two runs scored.